Two teenage gunmen in California fatally shot three people on Monday at the Islamic Center of San Diego, the largest mosque in the city. Among the dead was a security guard — Amin Abdullah, a father of eight — whom police credit with preventing more casualties. The 17- and 18-year-old suspects were found dead from apparent self-inflicted gunshot wounds in a car near the scene. Police are investigating the attack as a hate crime. The Council on American-Islamic Relations noted the attack comes as anti-Muslim bias complaints reached their highest level since they began tracking them in 1996, with 8,683 complaints filed nationwide. “This is a mosque that has opened its doors to the community,” says Palestinian American activist Linda Sarsour, co-founder of the Muslim rights and advocacy group MPower Change. “This is the epitome of a mosque that shows our true values as Muslims, in community and in solidarity. So, it’s just devastating, and no house of worship should have to ever experience this.”