[Senator Clay Davis]

A dispute at a holiday gathering may have sparked a mass shooting in San Bernardino that left 14 people dead and 17 others wounded on Wednesday morning, federal law enforcement officials said.

As many as three assailants, who carried long guns and wore masks, opened fire on a gathering of San Bernardino county employees around 11 a.m., sources and a witness told the Los Angeles Times.

A senior federal official who is monitoring the case said investigators believe one of the shooters left the party after getting into an argument and returned with one or two armed companions.

The shooting took place in a large conference room on the grounds of the Inland Regional Center, which serves people with developmental disabilities in Riverside and San Bernardino counties.

http://www.latimes.com/local/lanow/l...202-story.html