Twelve pipe bomb-like devices and thousands of bullets were found at the home of the man and woman who carried out a shooting attack on a San Bernardino social service facility, although the motive is not yet known, police say. The two suspects, Farook and Tashfeen Malik, had entered the United States together in July 2014, after which they married and had a child together. Syed Farook is a U.S. national but Malik is a Pakistani citizen who was staying in the United States on a K-1 visa, which allows foreigners to enter the U.S. to marry an American citizen.