FBI: California Bar Gunman was Ex-Marine Possibly Dealing with PTSD

Chilling cell phone footage revealed the terrifying moments of the gunman who shot and killed 12 people in a college California bar.

Now, the FBI is working to figure out why he did it.

The FBI says the gunman was 28-year-old David Long, a former Marine who may have been dealing with post-traumatic stress disorder.

They’re searching his home, car and belongings for a motive.

Before the shooting, he posted this on Facebook:

Investigators say Long had previous encounters with police.

One, as recent as April, which led him to mental health specialists.

Long took his own life as police moved in.