"Pakistan is one of those countries, there are other countries also involved...," Loretta Lynch, US Attorney General told NBC News yesterday.
The Federal Bureau of Investigation (FBI) is leading the probe into the killing of 14 people by Pakistani national Tashfeen Malik, and her husband, Syed Rizwan Farook, of Pakistan-origin on Wednesday. The US President has described this as an act of terror.
Tashfeen and Farook married in Saudi Arabia some two years ago after they initially came in contact over a matrimonial site.
Tashfeen, who spent most of her life in Saudi Arabia, was in Pakistan to complete her studies, before coming to the US as a fiance of Farook, a US national of Pakistani-origin.
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"A lot of information being processed, being analysed and being gathered and more to come. So, what I would say to people is that this investigation as it has already been stated is a marathon, not a sprint, but it is one of great concerns to the American people and so we're committed to keeping people informed," she said.
"I can say that is the focus of our investigation. We're looking at everything we can find out about these two killers' lives, how they grew up, where they grew up, how they met. All of those things will provide us guidance," she said.
Lynch said the US is also talking with Saudi authorities. "I'm not able to go into a lot of specifics there is because we are working closely with our foreign counterparts to gather that information. It will be a long process, it will be an exhaustive process and we are trying to learn as much as we can about her life before they met, after they met, and, frankly, after she came here as well," she said.