On December 2, 2015, 14 people were killed and 22 were seriously injured in a terrorist attack at the Inland Regional Center in San Bernardino, California, which consisted of a mass shooting and an attempted bombing.
The perpetrators, Syed Rizwan Farook and Tashfeen Malik, a married couple living in the city of Redlands, targeted a San Bernardino County Department of Public Health training event and holiday party, of about 80 employees, in a rented banquet room. Farook was an American-born U.S. citizen.
Source: 2015 San Bernardino attack – Wikipedia, the free encyclopedia