WITH GWEN IFILL
FRIDAY, DECEMBER 4 @ 9:00PM
Residents in San Bernardino, California, and across America remain in shock after Wednesday’s shooting massacre at a public health center that left 14 dead and 21 injured. Police discovered an arsenal of weapons including thousands of rounds ammunition and 12 pipe bombs inside a house the two suspects, Syed Rizwan and Tashfeen Malik, had been using, Pete Williams of NBC News will have the latest on the federal investigation and the search for a motive.