Police officers secure the area after at least one person opens fire at a social services agency in San Bernardino, California, Dec 2, 2015. The San Bernardino Police Department said on Twitter that it had "confirmed 1 to 3 possible suspects" and multiple victims in the shooting. The agency called it an "active shooter" incident.[Photo/Agencies]

SAN BERNARDINO - Fourteen people were killed at a social service agency in the Southern California city of San Bernardino on Wednesday, and a manhunt was under way for up to three suspects who opened fire, the police chief said.

A further 14 people were wounded, San Bernardino Police Chief Jarrod Burguan said in a televised news briefing. He said the suspects were believed to have fled the building, possibly making their getaway in a dark-colored sport utility vehicle.

Burguan said he knew no possible motive behind the attack, which unfolded at about 11 am at the Inland Regional Center in San Bernardino, about 60 miles (100 km) east of Los Angeles.