>> i'm victor blackwell. a stunning new report about how one of the san bernardino killers slipped into the u.s. despite openly talking about violent jihad online. "the new york times" reporters before tashfeen malik moved to the u.s. from pakistan she posted about her part to be a violent jihad. the posts were missed during three, yes, he three different background checks. had they been found, authorities might have been able to keep her out of the country. >> malik and her husband committed the deadliest terror attack since september 11th. we know 21 others were injured and 14 were killed. investigators have wrapped up their search at that lake going on for several days near the site of the massacre and cnn's annika cabrera has the latest. >> reporter: divers spent days combing this lake searching for