LATEST UPDATES:
- The number of wounded up to 21 from 17
- 12 pipe bombs found at suspects’ house
- Close to 300 officers responded to initial active shooter call
- 65-75 rounds of ammunition fired at the scene
- Suspects were not wearing bulletproof vests but tactical style vests
- Suspects had access to 1,600 rounds of ammunition
SAN BERNARDINO, California — San Bernardino gunman Syed Rizwan Farook had been in contact with known Islamic extremists on social media, a U.S. intelligence official said Thursday, and police said he and his wife had enough bullets and bombs to slaughter hundreds when they launched their deadly attack on a holiday party.
The details emerged as investigators tried to determine whether the rampage that left 14 people dead was terrorism, a workplace grudge or some combination.
READ MORE: Outpouring of grief, calls for gun control after mass shooting in California
The husband-and-wife killers were not under FBI scrutiny before the massacre, said a second U.S. official, who likewise was not authorized to discuss the investigation and spoke on condition of anonymity.
Four hours later and two miles away, the couple died in a furious gunbattle in which they fired 76 rounds, while 23 law officers unleashed about 380, police said.
READ MORE: What we know so far about the San Bernardino shooters
On Thursday, Police Chief Jarrod Burguan offered a grim morning-after inventory that suggested Wednesday’s bloodbath could have been far worse.
At the social service center, the couple left three rigged-together pipe bombs with a remote-control detonating device that apparently malfunctioned, and they had more than 1,600 rounds of ammunition remaining when police killed them in their rented SUV, Burguan said.
At a family home in the nearby town of Redlands, they had 12 pipe bombs, tools for making more, and over 3,000 additional rounds of ammunition, the chief said.
“We don’t know if this was workplace rage or something larger or both,” Attorney General Loretta Lynch said in Washington, echoing President Barack Obama. “We don’t know the motivation.”
A couple embraces following a shooting that killed multiple people at a social services facility, Wednesday, Dec. 2, 2015, in San Bernardino, Calif.
Investigators are trying to determine whether Farook, who was Muslim, became radicalized — and, if so, how — and whether he was in contact with any foreign terrorist organization, said the U.S. intelligence official, who was not authorized to discuss the matter publicly and spoke on condition of anonymity.
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The same official said Farook had been in touch on social media with extremists who were under FBI scrutiny.
READ MORE: ‘I’ll take a bullet before you do,’ San Bernardino cop says as he leads evacuees to safety
The second U.S. official said the FBI was treating the attack as a potential act of terror but had reached no conclusion that it was. The official said Farook’s contacts online did not involve any significant players on the agency’s radar and dated back some time, and there was no immediate indication of any surge in communication ahead of the shooting.
The official cautioned that such contact by itself doesn’t mean someone is a terrorist.
Rita Katz, director of SITE Intelligence Group, an organization that tracks and analyzes extremists, said it hasn’t found any connection so far between Farook and jihadi groups. But she also said that some of Farook’s social media posts seem to have been deleted before the attack.
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Wednesday’s rampage was the nation’s deadliest mass shooting since the Newtown, Connecticut, school tragedy three years ago that left 26 children and adults dead.
Twenty-one people were injured before the day was out in San Bernardino, a Southern California city of 214,000, including two police officers, authorities said. Two of the wounded remained in critical condition.
Authorities said the attack was carefully planned.
WATCH: Coverage of the shootings in San Bernardino, California.
“There was obviously a mission here. We know that. We do not know why. We don’t know if this was the intended target or if there was something that triggered him to do this immediately,” David Bowdich, assistant director of the FBI’s Los Angeles office, said as the bureau took over the investigation.
Farook has no known criminal record, Burguan said. He was born in Chicago to a Pakistani family, raised in Southern California and worked at San Bernardino County’s Department of Public Health for five years, according to authorities and acquaintances. The Saudi Embassy said he traveled to Saudi Arabia in the summer of 2014 for nine days.
As for Malik, she came to the U.S. in July 2014 on a Pakistani passport and a fiancée visa, authorities said. To get the visa, immigrants submit to an interview and biometric and background checks — screening intended to identify anyone who might pose a threat.
They were married on Aug. 16, 2014, in nearby Riverside County, according to their marriage license. Both listed their religion as Muslim.
The couple had a 6-month-old daughter who they dropped with relatives Wednesday morning before the shooting.
WATCH: Victims rushed to hospital following active shooter situation in California
Adam Lankford, a criminal justice professor at the University of Alabama, said his review of mass public shootings in the U.S. indicates this is the first one in recent history to involve a male-female team.
Federal authorities said Farook legally bought two handguns used in the massacre and their two assault rifles were legally bought by someone else. Authorities did not say how the rifles got into the attackers’ hands.
Two weeks ago, Farook and one of the co-workers he killed, 52-year-old Nicholas Thalasinos, had a heated conversation about Islam, according to Kuuleme Stephens, a friend of the victim.
Stephens said she happened to call Thalasinos while he was talking with Farook at work. She said Thalasinos told her Farook “doesn’t agree that Islam is not a peaceful religion.”
As for workplace conflicts, co-worker Patrick Baccari said that until the rampage, Farook showed no signs of unusual behavior and was a reserved young man.
Baccari said he was sitting at the same banquet table as Farook before Farook suddenly disappeared, leaving his coat on his chair. Baccari was in the bathroom when the shooting started; he suffered minor wounds from shrapnel slicing through the wall.
A victim is wheeled away on a stretcher following a shooting that killed multiple people at a social services facility, Wednesday, Dec. 2, 2015, in San Bernardino, Calif.
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