US investigators believe the army doctor accused of killing 13 people in a shooting rampage at a Texas military base acted alone, but his motive for the massacre was unclear, officials said. President Barack Obama will Tuesday attend a memorial service here to honor victims of the rampage at Fort Hood attributed to Muslim US army doctor Major Nidal Malik ...

As if going off to war, Maj. Nidal Malik Hasan cleaned out his apartment, gave leftover frozen broccoli to one neighbor and called another to thank him for his friendship — common courtesies and routines of the departing soldier. Instead, authorities say, he went on the killing spree that left 13 people dead. Investigators examined Hasan's computer, his home and ...