13 dead in California bar after gunman opens fire (Update: shooter identified)

At least 13 are dead after a gunman opened fire at a crowded bar in Thousand Oaks, California. The dead include the shooter and a Sheriff's sergeant who tried to stop him.

A man, identified by authorities as Ian David Long, 29, entered the Borderline Bar and Grill at 11.20pm, threw smoke grenades into the crowd, then fired dozens of rounds into it, eyewitnesses say. Long was reportedly dressed entirely in black and wearing a mask.

Authorities do not know what his motive was, but Ventury County Sheriff Geoff Dean told reporters that he has "no reason to beleive there was a link to terrorism" and that the only weapon recovered was a "modified" .45 Glock handgun. The sergeant killed in the attack was a 29-year veteran about to retire, according to wire reports.

Thousand Oaks is an upscale LA exurb listed as one of the safest places to live in America. The Borderline Bar & Grill is described by Google as "a lively spot with Western decor & dancing" hosting country and salsa theme nights.

Pepperdine University in nearby Malibu reports that some of its students were there attending a "student night" event.

Updated at 10 a.m. with the shooters' name and weapon. ABC News says Long was a USMC veteran.