The married couple who killed 14 people and wounded 21 others at a social-services center in San Bernardino, California, fired up to 75 rounds in the attack, left behind three pipe bombs that had been rigged together, and had thousands of rounds of ammunition on them and at their home, officials said. Police are investigating terrorism and a workplace dispute as possible motives. Police recovered a haul of weapons and ammunition both from the vehicle in which Farook and Malik were found and at a home they had rented. At least 14 people are dead and 21 wounded, up from 17 on Wednesday, in the attack, which occurred at the Inland Regional Center in San Bernardino. Both shooters were shot and killed by police officers. They were married and had a six-month old daughter. The shooters have been identified by police as 28-year-old Syed Rizwan Farook and 27-year-old Tashfeen Malik.