At least 17 people were killed and several wounded in a mass shooting at Marjory Stoneman Douglas High School in Parkland, Florida, and a suspect was identified by authorities shortly after 5:30 p.m. ET.

Bret Baier reported the casualty count around 6:15 p.m. ET on "Special Report."

The local sheriff's office says as many as 20 to 50 people were injured.

"Many people have been killed," Sen. Bill Nelson (D-Fla.) told Fox News' Peter Doocy.

Police have apprehended a person of interest in a nearby neighborhood.

According to Shepard Smith, the Associated Press identified the suspect as Nikolas Cruz.

Cruz was a former member of the U.S. Army Junior Reserve, Trace Gallagher reported.

"He would shoot guns because it gave him an exhilarating feeling," Gallagher said.

Earlier, the shooter was described as wearing a maroon shirt and black pants.

Police locked down the school, but have since allowed students to leave. Lines of students could be seen walking out of the school, while paramedics treated injured students. 

Police notified all area hospitals to expect to receive victims from the school. 

The school, located in Broward County north of Fort Lauderdale, is attended by 3,200 students in grades 9 to 12.

Stay tuned to Fox News Channel for updates on this breaking story.