Three Iraqi refugees in Virginia were charged with immigration fraud on Tuesday after failing to disclose their relationship to a man who was involved in the kidnapping of a U.S. citizen in Iraq in 2004, the Justice Department said.

U.S. authorities in Pakistan could have sought - but did not - a full background security investigation of San Bernardino shooter Tashfeen Malik before granting her a visa to enter the United States in 2014, according to a U.S. official familiar with the matter.