Washington Post | After San Bernardino rampage, probes grapple with motives, questions on planning Washington Post SAN BERNARDINO, Calif — Investigators grappled Thursday on two main fronts after the deadliest U.S. mass shooting since the Sandy Hook Elementary School bloodshed: Seeking clues on the motives and apparent commando-style planning by a couple ... Police, feds probe terror as possible motive in SoCal massacre This Morning from CBS News, Dec. 3, 2015 Motive Still a Mystery in San Bernardino Shooting as Police Investigate Shooters |