Investigators believe the weapons cache collected by Tashfeen Malik, 29, and her husband, Syed Rizwan Farook, 28, points to more attacks but they do not have evidence on other possible targets, a senior US government source told Reuters.
The couple stormed a gathering of his work colleagues in San Bernardino, California, on Wednesday, opening fire with assault-style rifles and killing 14 people. The pair were killed a few hours later in a shootout with police.
US authorities were trying to learn what contacts Malik might have had with Islamic militants in Pakistan and Saudi Arabia, where she grew up, the official said.
They lack clear evidence that the wife was radicalised overseas or that she in turn radicalised her husband, though they are actively investigating that, the official said. Authorities are investigating the shootings as an act of terrorism.
Malik’s estranged relatives in Pakistan have said she appeared to have abandoned the family’s moderate Islam and become more radicalised in Saudi Arabia, where she moved as a toddler.
She returned to Pakistan and studied pharmacy at Bahauddin Zakaria University in Multan from 2007 to 2012.
“There’s a serious investigation ongoing into what she was doing in Pakistan and in Saudi,” US Representative Michael McCaul said on Fox News Sunday. “We think that she had a lot to do with the radicalisation process and perhaps with Mr Farook’s radicalisation from within the United States.”
“The wild card here is the wife Malik,” said McCaul, Republican chairman of the House Homeland Security Committee. He said officials were also looking at where they got the money for the guns. US attorney general Loretta Lynch said US authorities have no evidence the shooters were part of a larger terrorism cell but were working with their counterparts overseas to gather information about their lives.
“We are trying to learn everything we can about both of these individuals,” Lynch said on NBC’s Meet the Press. “It will be a long process, it will be an exhaustive process.”
The facts emerged as US President Barack Obama was preparing to address the nation from the Oval Office about steps the government is taking to keep people safe after the shooting rampage.