Shooter Opens Fire on Military Buildings in Tennessee, Killing Four Marines

3:03 pm ET: "Today is a nightmare for the city of Chattanooga,” Chattanooga Mayor Andy Burke said at a press conference on Thursday afternoon. He added that the gunman “viciously attacked — at two different locations — people who proudly served our country.”

In addition to praising first responders, Burke said that four individuals were killed and that the shooter was also killed at the scene. The hospitalized police officer was shot in the ankle and treated, he added.

“There were some other individuals who were shot and have also been treated,” Burke said. “It is incomprehensible to see what happened and the way that individuals who proudly served our country were treated.”

U.S. Attorney Bill Killian who also appeared at the event initially said that the crime would be treated as an act of domestic terrorism, but FBI special agent Ed Reinhold said that all these cases are treated as terrorism until proven otherwise, and that this has not officially been determined to be “domestic terrorism."

Killian then came back to the podium to encourag people to hold off on labeling the crime. Local police will be working with Homeland Security, the FBI and ATF in moving forward on the investigation.

Specific details about the shooter and the victims were not given.

2:55 pm ET: US official tells AP: "5 dead in Tennessee shooting, including 4 Marines and sole gunman."

2:28 pm ET: Additional witnesses speak out about what they saw:

2:20 pm ET: Times Free Press reports that four Marines were killed, but CNN is reporting that three died.

1:59 pm ET: The shooter is reportedly dead, according to WRCB-TV.

1:53 pm ET: Authorities will hold a 2 p.m. ET news conference.

1:30 pm ET: Police confirm: "Active shooter situation is over. Details forthcoming."

1:26 pm ET: AP confirms: "At least two military facilities in Tennessee were attacked":

The U.S. Navy said in a tweet that there was a shooting at a Navy recruiting building on Amnicola Highway in Chattanooga.

Law enforcement officials told recruiters at a facility 7 miles away on Old Lee Highway that they were also attacked by a shooter in a car. The shooter stopped in front of the recruiting facility, shot at the building and drove off, said Brian Lepley, a spokesman with the U.S. Army Recruiting Command in Fort Knox, Kentucky.

1:15 pm ET: There is reportedly no longer an active shooter, though details are sparse on what that means. WTVC-TV reported: Federal officials say there is currently no confirmation or indication the shooting is terrorism.

1:10 pm ET: I was out on break and all of the sudden I heard about 10 or 15 pops, just really fast pop, pop, pop and ... I said that sounds like gunfire and the next thing I knew there was police everywhere," witness Marilyn Hutcheson tells WRCB-TV.

1:04 pm ET: A photo uploaded to Facebook purports to show the entrance to a Navy building after the shooting:

1:00 pm ET: "There has been several (shootings) at several different locations. It's a fluid situation," Tennessee Highway Patrol spokesman John Harmon told Reuters; there is no confirmation on whether they are related.

12:56 pm ET: The Department of Homeland Security has reportedly activated a strike team to find the shooter.

12:50 pm ET: Witnesses claim that shooter was a white male. Erlanger Hospital remains on lockdown, and shell casings were reportedly found outside of a requirement center, according to WRCB-TV.

12:43 pm ET:CBS News is reporting that four U.S. Marines and one police officer were shot during the incident.

12:40 pm ET: Police are investigating two separate shootings, one at a Navy reserve center on Amnicola Highway and another at a Navy building in the city, CNN reported.  

Original story below.

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A police officer has reportedly been injured in an incident that unfolded on Thursday at the Naval Recruitment Center in Chattanooga, Tennessee, according to WTVC-TV.

Authorities are investigating an "active shooter" incident, with Chattanooga Mayor Andy Burke tweeting, "Horrific incident in our community. We will release details as they are confirmed. Prayers to all those affected."

Horrific incident in our community. We will release details as they are confirmed. Prayers to all those affected

— Andy Berke (@AndyBerke) July 16, 2015

Around 12 p.m. ET, the U.S. Navy also tweeted that officials are looking into the matter, writing, "#USNavy investigating report of shooting in #Chattanooga, TN. No confirmation. More to follow." That tweet was followed up with a subsequent message that read, "#USNavy confirms shooting at building on Amnicola Highway."

Details into the incident are still sparse, but one witness told CNN that she saw a man with a "high-powered rifle" fire shots from a silver Mustang; authorities are reportedly looking for the vehicle.

"I don't know how many shots he fired, but it was a lot," Gina Mule said.

Chattanooga State Community College issued a tweet to its community as well that referenced a "confirmed shooting. It read, "Tiger Alert!!! Main Campus: Confirmed shooting. Stay away from Riverpark. Everyone stay inside, close doors."

The local hospital is also being heavily guarded, with some reports claiming that the injured police officer could be inside.

"There are two heavily armed police officers ... guarding the ER entrrance at Erlanger Hospital," WRCB-TV reported around 12:30 ET.

Watch live coverage below:

WRCBtv.com | Chattanooga News, Weather

This is a breaking news story. Stay tuned for updates.