There were two explosions near the finish line of the Boston Marathon near Boylston Street on Monday afternoon.

Three people are confirmed dead and over one hundred more are injured.

There is no indication as to what caused the explosions.

Refresh this page for the latest updates.

UPDATE, 10:17a ET: In a media update, a doctor from Mass. General said that "pellets and nail" have been removed from victims' bodies. He also said that of the hospital's patients, four amputations have been performed, adding that most of the injuries were on lower extremities.

UPDATE, 10:15a ET: At the just-concluded press conference Gov. Deval Patrick said that the bombs that exploded on Boylston Street were the only two explosive devices that were found. "It's important to clarify that two and only two explosive devices were found yesterday. All other parcels in the area of the blast have been examined but there were no unexploded bombs - there were no unexploded explosive devices found."

UPDATE, 10:05a ET: Ed Davis said the toll remains at three dead, with 17 victims in critical condition at local hospitals. Special Agent-in-Charge of the FBI's Boston Field Office Richard DesLauriers vowed we will "go to the ends of the earth" to find out who is responsible for this horrific attack. He said authorities are interviewing a "variety of witnesses in a variety of locations" but refused to go into detail about the investigation.

UPDATE, 9:05a ET: A statement has just been released, stating that the FBI will hold a media briefing at 9:30a ET: Special Agent-in-Charge of the FBI's Boston Field Office Richard DesLauriers, United States Attorney Carmen Ortiz, and other law enforcement officials will update the media on the on-going investigation regarding the explosions in and around the Boston Marathon route, Tuesday, April 16, at 9:30 a.m. at The Westin Copley Plaza.

The FBI continues to urge the public to call the FBI tip line at 1-800-CALL-FBI with any information regarding the explosions or those who may be responsible. Anyone with any digital media that may be helpful to the investigation, including video, audio and/or still images, is urged to provide it to the FBI via email at Boston@IC.FBI.Gov.

If a media file is too large to submit via email, please call 1-800-CALL-FBI.

TUESDAY - UPDATE, 8:30a ET: One of the victims has been identified by the Boston Globe as 8-year-old Martin Richard. Find out more about his story here, as well as the status of the other victims, in the latest update.

UPDATE, 11:23p ET: Greta Van Susteren reports that law enforcement is searching an apartment in Revere, Massachusetts.

UPDATE, 10:50p ET: There will be a briefing on Capitol Hill tomorrow morning by the National Counterterrorism Center.

UPDATE, 10:45p ET: Catherine Herridge reports that a federal source confirms they are investigating a Saudi national. The individual is a man between the age of 20 and 21, and he is not being described as a suspect at this time.

UPDATE, 10:18p ET: 29 patients are being treated at Massachusetts General Hospital, including 8 in critical condition. Watch the Mass. General press conference here.

UPDATE, 8:55p ET: Massachusetts Gov. Deval Patrick and Boston Police Commissioner Ed Davis, along with the FBI, are briefing reporters. Davis said at least three people died in the explosions. He also said "there is no suspect" at Brigham Women's Hospital, despite what has been reported by some outlets. He said authorities are talking to people, but aren't identifying anyone as a suspect yet. Watch the press conference here.

UPDATE, 8:14p ET: Boston Marathon runner Demi Clark had just crossed the finish line when the first explosion occurred. “I knew it wasn’t right,” she told Shepard Smith. Hear her full account here.

UPDATE, 8:00p ET: The president of Boston University issued a statement Monday night saying that a BU student is among those injured in today's explosions. Read the full statement here.

UPDATE, 7:52p ET: Police released excerpts of scanner traffic in the moments following the two explosions. Listen to the audio here.

UPDATE, 7:35p ET: Video footage from The Boston Globe captures the moment of the first of two explosions at today’s Boston Marathon as runners, spectators and event staff react to the terrifying blast. Watch the video here.

UPDATE, 7:27p ET: The U.S. Navy is sending one of its bomb-disposal units to Boston to assist local authorities as needed. The Associated Press reports, "The three-member explosive ordnance disposal team based at Naval Station Newport, R.I., was sent to Massachusetts after state officials asked for help."

UPDATE, 7:25p ET: Fox News' Catherine Herridge updated us on Fox Report about what her intelligence sources are saying about the bombings, particularly on who may be responsible. There have been no claims of responsibility on any Muslim extremist websites, according to her sources. Herridge says investigators are focused on gathering bomb residue from the scene and finding the bomb maker's signature, helping them to figure out how the device was constructed. She said the bombings have all the hallmarks of a terrorist attack, including a first explosion that may have been intended to push people toward the second blast.

UPDATE, 7:07p ET: On tonight's Fox Report, Shepard Smith reported that preliminary information indicates that an 8-year-old boy may be one of the two people confirmed dead. Smith also said that 105 people have been taken to hospitals with injuries as a result of the blast.

UPDATE, 6:30p ET: Read the transcript of the president's remarks on the Boston bombings.

UPDATE, 6:22p ET: President Obama addressed the nation on the bombings. "The American people will say a prayer for Boston tonight. Michelle and I send our deepest thoughts and prayers to the families and victims in the wake of this senseless loss." Watch his remarks here.

UPDATE, 6:00p ET: Boston Police Commissioner Ed Davis said the reports of a suspect in custody are not true.

UPDATE, 5:46p ET: This just in: President Obama will address the nation on the Boston explosions tonight at 6:10p ET. Tune in to Fox News Channel for live coverage.

UPDATE, 5:40p ET: The Associated Press contacted two cell phone service providers in the Boston area who say they did not shut down cell phone service.

UPDATE, 5:38p ET: The FAA placed a Temporary Flight Restriction (TFR) over the city of Boston at the request of law enforcement. The TFR was initially a three nautical mile radius from the site and extended from the surface to 3,000 feet, which included choppers that had been in the air covering the marathon. The FAA has reduced the radius to two miles. The FAA put a ground stop in place briefly to change the runway configuration at Logan Airport, but has lifted it.

UPDATE, 5:27p ET: The incident at the JFK Library in Dorchester appears to be related to a fire.

UPDATE, 5:20p ET: Police are asking everyone in Boston to stay home and to not congregate in large groups. Watch the video of the press conference here.

UPDATE, 5:17p ET: Cell phone service has been shut down in the Boston area to prevent remote detonations of explosions.

UPDATE, 5:15P ET: A source tells Fox News that authorities in Boston are guarding a "person of interest" who is currently in a hospital. The person has severe burns. Source says though that authorities have yet to determine whether he was a victim or a perpetrator.

UPDATE, 5:02p ET: Vice President Joe Biden was speaking on a conference call about gun control that was previously scheduled when he saw television reports of the Boston Marathon explosions. Audio of the call was released, in which the vice president used the word “bombing” to describe the event. Listen to the call here.

UPDATE, 5:00p ET:  Here's the latest information from Boston Police Commissioner Ed Davis: The explosions on Boylston Street near the finish line of the Boston Marathon occurred at 2:50p ET, about 50-100 yards apart. Each blast caused multiple casualties. All victims have been removed from the scene. People in Boston should stay in indoors and not congregate in large groups while police continue to investigate. There was a third explosion at the JFK Library and police right now are treating it as a related incident. The next briefing is scheduled for 7p ET.

UPDATE, 4:51p ET: A media briefing is underway in Boston following the deadly explosions that ... calling it an "ongoing event" following the confirmation of a third explosion that happened recently at JFK Library in Dorchester. Watch the briefing on Fox News Channel. And stay tuned here for video and highlights. Below is a photo of Gov. Patrick speaking at the event moments ago: 

UPDATE, 4:50p ET: The below photo shows tape cordoning off the White House gates due to heightened security in the nation's capitol. 

UPDATE, 4:46p ET: Boston police just confirmed another explosion at the JFK Library in Dorchester. More information on that explosion is not yet known. The following statement is just out from the FAA: "The FAA has placed a Temporary Flight Restriction (TFR) over the site of the explosion in Boston at the request of law enforcement. The TFR is three nautical miles from the site and extends from the surface to 3,000 feet. It allows commercial air traffic operations to continue."

UPDATE, 4:39p ET: Former Massachusett's Governor Mitt Romney tweets: @MittRomney @ 1636: Our hearts are heavy with the news out of Boston today. #PrayforBoston

UPDATE, 4:37p ET: Neil Cavuto reports that a suspect has been identified and is being guarded in a Boston hospital, according to the New York Post.

UPDATE, 4:36p ET: Boston marathon runner’s witness account of explosions, "It was pandemonium." Hear his account here.

UPDATE, 4:31p ET: This statement just in from the Department of Justice: "The Attorney General has spoken with FBI Director Mueller and U.S. Attorney Carmen Ortiz. Attorney General Holder has directed the full resources of the Justice Department to be deployed to ensure this matter is fully investigated." The U.S. Attorney's Office for the District of Massachusetts is coordinating the Justice Department response with FBI, ATF and other federal, state and local law enforcement authorities."

UPDATE, 4:23p ET: Neil Cavuto just reported that according to sources, two more explosive devices have been found and are being dismantled.

UPDATE, 4:18p ET: Boston Fire Dept. tweeted that a media briefing will take place at 4:30p ET at the Westin Hotel's third floor, Essex South meeting room. We'll bring you live coverage on Fox News Channel and continuing updates here on Fox News Insider.

UPDATE, 4:15p ET: We've just gotten the first video showing one of the explosions as it hit. Boston PD says two people have been killed and 23 injured. Stay with Fox News as we await a briefing from officials in Boston.

UPDATE, 4:08p ET: During live coverage on Studio B, Shepard Smith said that a doctor from Massachusetts General Hospital, where explosion victims were being rushed, told a Fox News source that 10 patients with amputations and blown off limbs are currently in the emergency room at Mass. General Hospital. More patients are en route.

UPDATE, 4:06p ET: The Boston Marathon posted this statement on their Facebook page moments ago: “There were two bombs that exploded near the finish line in today’s Boston Marathon. We are working with law enforcement to understand what exactly has happened.”

UPDATE, 3:55p ET: Fox affiliate reporter Maria Stephanos gave an eyewitness account of the explosion on air on Tuesday afternoon. Watch the video here. We've also learned that President Obama has been notified of the incident. A White House spokesperson said, “His administration is in contact with state and local authorities. He directed his administration to provide whatever assistance is necessary in the investigation in response.”

UPDATE, 3:50p ET: Fox News anchor Shepard Smith, in reading eyewitness accounts, said it appeared preliminarily as though a device was rigged with shotgun pellets, so that when the explosion took place it would 'create terror.'

UPDATE, 3:44p ET: A photo shows one of the explosions. 

UPDATE, 3:42p ET: The New York Police Department has stepped up security around landmarks in Manhattan, including near prominent hotels, according to NYPD Deputy Commissioner Paul Browne.

UPDATE, 3:39p ET: Shepard Smith reports that police are checking to see if any devices may have been placed in barrels or garbage cans near race path. Reports out of Boston suggest that there's more than one location for these explosions.

UPDATE, 3:34p ET: Click here for more photos from the scene

UPDATE, 3:30p ET: According to Boston police, three people have died.

UPDATE, 3:24p ET: The latest from The Associated Press -- Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers in the 26.2-mile trek from Hopkinton were rerouted away from the smoking site of the blasts. Competitors and race organizers were crying as they fled the chaos. Bloody spectators were being carried to the medical tent that had been set up to care for fatigued runners. "There are a lot of people down," said one man, whose bib No. 17528 identified him as Frank Deruyter of North Carolina. He was not injured, but marathon workers were carrying one woman, who did not appear to be a runner, to the medical area as blood gushed from her leg. A Boston police officer was wheeled from the course with a leg injury that was bleeding. About three hours after the winners crossed the line, there was a loud explosion on the north side of Boylston Street, just before the photo bridge that marks the finish line. Another thunderous explosion could be heard a few seconds later. Runner Laura McLean of Toronto said she heard two explosions outside the medical tent. "There are people who are really, really bloody," McLean said. "They were pulling them into the medical tent." Cherie Falgoust was waiting for her husband, who was running the race. "I was expecting my husband any minute," she said. "I don't know what this building is ... it just blew. Just a big bomb, a loud boom, and then glass everywhere. Something hit my head. I don't know what it was. I just ducked."

UPDATE, 3:12p ET: Jonathan Hunt reports that according to The Boston Globe, dozens of people are seriously injured.