Los Angeles TimesA year after the San Bernardino terror attack, the FBI is still struggling to answer key questionsLos Angeles TimesIn the year since Syed Rizwan Farook and Tashfeen Malik killed 14 people in a terrorist attack in San Bernardino, authorities have conducted more than 600 interviews, gathered more than 500 pieces of evidence and served dozens of search warrants.Christmas Party May Have Triggered San Bernardino Terror Attack: PoliceABC NewsSan Bernardino terror attacker pictured moments before opening fire with his wifeDaily MailCounty pledges faster care for Dec.