The Islamic State of Iraq and Syria (ISIS) group said in an online radio broadcast on Saturday that two followers of the militant group had carried out Wednesday’s attack on a social services agency party in California in which 14 people were killed.
“Two followers of Islamic State (ISIS) attacked several days ago a center in San Bernadino in California.” the group’s daily broadcast al-Bayan said.
A news agency which supports ISIS said on Friday the attackers were followers of the group. U.S. government sources have said there is no evidence the attack was directed by the militant group, or that the organization even knew who the attackers were.
FBI investigation
The FBI began investigating the fatal shooting of 14 people in California by a married couple as an “act of terrorism,” officials said on Friday, noting the wife was believed to have pledged allegiance to a leader of the militant group ISIS.
While the FBI said it lacked evidence the couple belonged to a larger organization of extremists, the Los Angeles Times cited a federal law enforcement source in reporting that the husband, Syed Rizwan Farook, 28, had contact with at least two militant groups overseas, including the al Qaeda-affiliated al-Nusra Front in Syria.
Both the U.S.-born husband and his spouse, Tashfeen Malik, 29, a native of Pakistan who lived in Saudi Arabia for more than 20 years, died in a shootout with police hours after Wednesday’s attack on a holiday party at the Inland Regional Center social services agency in San Bernardino, about 60 miles (100 km) east of Los Angeles.
If the mass shooting proves to have been the work of people inspired by militants, as investigators now suspect, it would mark the deadliest such attack in the United States since Sept. 11, 2001.
Federal Bureau of Investigation officials said mounting signs of advanced preparations, the large cache of armaments amassed by the couple and evidence that they “attempted to destroy their digital fingerprints” helped tip the balance of the investigation.
“Based on the information and the facts as we know them, we are now investigating these horrific acts as an act of terrorism,” David Bowdich, assistant director of the Federal Bureau of Investigation’s Los Angeles office, said at a news conference.
Bowdich said the FBI hoped examination of data retrieved from two smashed cellphones, and other electronic devices seized in the investigation, would lead to a motive for the attack.
The couple had two assault-style rifles, two semi-automatic handguns, 6,100 rounds of ammunition and 12 pipe bombs in their home or with them when they were killed, officials said. And Bowdich said they may have been planning an additional attack.
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