On December 2, 2015, 14 people were killed and 22 others were seriously injured in a terrorist attack consisting of a mass shooting and an attempted bombing at the Inland Regional Center in San Bernardino, California. 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 Christmas party of about 80 employees in a rented banquet room. Farook was a U.S.-born citizen of Pakistani descent, who worked as a health department employee. Malik was a Pakistani-born lawful permanent resident of the United States.
After the shooting, the couple fled in a rented sport utility vehicle (SUV). Four hours later, police pursued their vehicle and killed them in a shootout, which also left two officers injured.
According to the FBI's investigation, the perpetrators were "homegrown violent extremists" inspired by foreign terrorist groups. They were not directed by such groups and were not part of any terrorist cell or network. FBI investigators have said that Farook and Malik had become radicalized over several years prior to the attack, consuming "poison on the internet" and expressing a commitment to jihadism and martyrdom in private messages to each other. Farook and Malik had traveled to Saudi Arabia in the years before the attack. The couple had amassed a large stockpile of weapons, ammunition, and bomb-making equipment in their home.
Enrique Marquez Jr., a friend and former neighbor of Farook's, was investigated in connection with his purchase of the two rifles used in the attack. Marquez was arrested in December 2015, and later pleaded guilty to federal charges of provide material support for terrorism and making false statements in connection with the acquisition of a firearm. Marquez also admitted that, in 2011, he conspired with Farook to carry out shooting and bombing attacks, plans which were abandoned at the time. Three other people, including Farook's brother and sister-in-law, were arrested for immigration fraud in connection with a sham marriage between Marquez and Mariya Chernykh (the sister-in-law of Farook's brother). All three pleaded guilty.
The attack was the deadliest mass shooting in the U.S. since the 2012 Sandy Hook Elementary School shooting, and the deadliest terrorist attack to occur in the U.S. since the September 11 attacks
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