Investigators collected 42 bullet casings from the scene of one of California's bloodiest mass shootings as they sought clues on Monday to what drove an elderly gunman to open fire in a dance hall he had frequented, killing 11 people, before taking his own life.
Police identified Huu Can Tran, 72, as the lone suspect in a massacre that unfolded Saturday night in the midst of a Chinese Lunar New Year celebration in the town of Monterey Park, a hub of the Asian-American community just east of downtown Los Angeles.
