The FBI will be hosting a press conference at around 2:00 p.m. ET this afternoon to give a briefing on the details of  the Washington D.C. Navy Yard shooting. You can watch the live stream below.

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The shooter has been identified as 34-year old Aaron Alexis, formerly with the Navy Reserves who has since been shot and is now deceased. The FBI is asking that anyone with any insight into Alexis and what his motive might have been to come forward to aid with the investigation in any way possible.

13 people are confirmed to have died during the shooting and several were injured.

The U.S. Navy had confirmed over social media networks that a shooting took place, but it is thought Alexis acted as the lone gunman. The incident was reported at around 8:40 a.m. ET Monday, though the U.S. Navy noted shots were fired at approximately 8:20 a.m. at the Navy Sea Systems Command Headquarters, Building 197. Some 3,000 people work in the facility engineering, purchasing, building, and maintaining ships and submarines for the Navy.

Alexis was once a member of the Navy Reserves stationed in Fort Worth, Texas where he spent four years only to be generally discharged. According to CBS, his military records indicate “a pattern of misconduct.” He was generally discharged.

He then took up work as an independent defense contractor, working at times at the same Navy Yard he unloaded a shotgun as well as a handgun he disarmed from an officer, and it was initially thought he carried an AR-15 semi automatic rifle but the FBI has no confirmation that particular firearm was discharged or even present.

Alexis was twice arrested for gun-related incidents, one being where he shot out the tires of a construction worker’s car and the other being when he fired a bullet through his downstairs neighbor’s ceiling.