Baltimore Police Commissioner Anthony Batts said during a press conference that at least 15 officers were injured during the violent protests in Baltimore on Monday.

He stated that at least six of those injured officers suffered "serious injuries" from being pelted with bottles, rocks and other debris by protesters in the city throughout the day. 

"I told them how proud I was of them and how courageous they were," Batts said of the officers.

He also stated that there were a number of car fires and other blazes that were set in the streets.

Batts remarked that law enforcement officers were still working to try and gain control over the hectic situation in the city. 

Protests erupted hours after the funeral for Freddie Gray, the black man who died while in police custody earlier this month. 

A massive fire also broke out in a building that was under construction and is believed to be related to the riots, the Associated Press reported. 

Leland Vittert reported that there were several reports of people going inside the Mondawmin Mall, looting and destroying property. 

Gov. Larry Hogan issued a statement Monday evening where he declared a state of emergency and called up the National Guard to assist in restoring peace to the city.

"These acts of violence and destruction of property cannot and will not be tolerated," Hogan said during a press conference.

Fox News reported:

A police source told Fox News several gangs, including Black Gorilla Family, Bloods and Crips all had “entered into a partnership to take out law enforcement officers.”

Activists from the Nation of Islam claimed responsibility for bringing the gangs together, telling reporters that they brokered a deal between the hated foes.

“I can say with honesty those brothers demonstrated they can be united for a common good,” Nation of Islam minister Carlos Muhammad told The Daily Beast. “At the rally, they made the call that they must be united on that day. It should be commended.”

Watch the video above to hear more. 

UPDATE, 1:00a ET: Megyn Kelly reported that people were allegedly "throwing cinder blocks at fire trucks" that were racing to the scene of a new building fire in the city.

Leland Vittert reported that looters were also stealing liquor bottles from two separate stores as police stood in a riot line roughly 150 feet away not stopping them. 

Stay tuned to Fox News Channel for more updates on this situation.

LATEST on Fox News Insider...

Judge Nap: 'No Legal Justification for This Kind of Behavior' in Baltimore

Joe Hicks: Dr. King Has to Be 'Spinning' in His Grave Right Now

See the Most Dramatic Photos From the Baltimore Protests

Baltimore Mayor: 'Destroying Property Will Impact Our Community For Years'