TO GO WITH AFP STORY by Jocelyne ZABLIT, "Year after San Bernardino, US grapples with lone wolf attacks"
(FILES) This file photo taken on December 3, 2015; shows Investigators looking at the vehicle involved in a shootout between police and two suspects in San Bernardino, California. One year after Syed Rizwan Farook and Tashfeen Malik stormed an office party on December 2, 2015, in San Bernardino, California, killing 14 people and injuring 22 others, the country is still grappling with how best to thwart such lone wolf attacks. / AFP PHOTO / Patrick T. Fallon