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WASHINGTON (AP) — The Pakistani woman accused of carrying out a mass shooting last week in Southern California was one of 519 Pakistanis approved to come to the U.S. to marry a U.S. citizen last year.

Tashfeen Malik’s path to the United States raised immediate questions about the government’s system for vetting foreign fiancés after her role in the deadly attack was revealed.

Now Homeland Security Secretary Jeh Johnson says the Obama administration is reviewing the program.

Known as the K-1 visa program, it is among the smallest visa categories managed by the government.

State Department records show that, of the more than 9.9 million visas issued in fiscal year 2014, about 36,000 were fiancé visas.