Bombs And Ammo At California Attackers' Home

Police say they found a dozen pipe bombs and nearly 5,000 rounds of ammunition at the home of the husband and wife behind Wednesday's mass shooting in southern California.

San Bernardino Police Chief Jarrod Burguan said Syed Rizwan Farook and Tashfeen Malik also had tools that could be used to make improvised explosive devices at their Redlands house.

He told reporters the couple had sprayed between 65 and 75 rounds on Wednesday morning at a social services centre in San Bernardino, killing 14 people and injuring 21 others.

The victims, ranging in age from 26 to 60, have been named as Shannon Johnson, Bennetta Bet-Badal, Aurora Godoy, Isaac Amanios, Larry Kaufman, Harry Bowman, Yvette Velasco, Sierra Clayborn, Robert Adams, Nicholas Thalasinos, Tin Nguyen, Juan Espinoza, Damian Meins, and Michael Wetzel.Farook, 28, and Malik, 27, left behind three connected pipe bombs which were designed to be operated by a toy car remote control, but didn't work.

The suspects fired another 76 rifle rounds at police in a car chase after the massacre.

They had more than 1,600 bullets with them when they were gunned down in their rented black Ford Expedition.

David Bowdich, assistant director of FBI Los Angeles office, would not comment explicitly on reports that Farook may have been radicalised and was communicating with suspected terrorists.

"There was obviously a mission here," he told journalists. "We do not know why."Mr Bowdich said there was "some level of sophistication" in the pipe bombs.

He confirmed they were looking into whether the couple had learned to make the devices from an article in al Qaeda magazine, Inspire.

Investigators said they still don't know whether the couple targeted anyone in particular or just fired at random.

Farook left a Christmas party attended his own colleagues in the county health department after an apparent dispute, leaving his coat on his chair.

The US-born restaurant inspector returned a short time later with Malik, both of them dressed in black tactical gear and wielding weapons.

Farook's colleagues had recently held a baby shower for him and his wife, a former co-worker told the Los Angeles Times.

On the morning of the assault, the two dropped off their six-month-old baby with Farook's mother, telling her they were going to a doctor's appointment.

The two assault rifles and two handguns used in the attack were all bought legally four years ago in the US. 

Twenty-three police officers gave chase and fired 380 rounds at the suspects, according to Chief Burguan.Two officers were injured, one of whom was shot in the leg and another who was hurt by flying glass or shrapnel.

Farook, the son of Pakistani immigrants, had travelled to Saudi Arabia and returned with his new wife, after meeting her online.

Malik, a Pakistan passport holder, was in the US on a visa issued to spouses of American citizens.