(CNN)The gunman who killed 12 people at the Borderline Bar & Grill in Thousand Oaks, California, was a 28-year-old veteran of the US Marine Corps who had previous run-ins with the law, officials said.

Here’s what we know about Ian David Long so far:

The gunman is believed to have killed himself

The shooter is dead, and his body was found inside the bar when police were able to enter the building, Ventura County Sheriff Geoff Dean said.

Dean said he believed that the gunman killed himself.

The gunman used one handgun

Dean said that officials found a Glock .45-caliber handgun at the scene that was purchased legally. The weapon usually holds 10 rounds, plus one in the chamber, but the gunman used an extended magazine in this shooting, Dean said.

Dean said he did not know of the shooter’s motive, and he did not know of any connection between Long and the Borderline bar.

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