Two teens attack San Diego mosque; security guard killed protecting worshippers

Two teenage gunmen armed with handguns and rifles stormed the Islamic Center of San Diego, killing a security guard who sacrificed his life protecting worshippers; the suspects died from self-inflicted gunshots as police arrived. Investigators say they were radicalized online and left a manifesto, with about 30 firearms recovered in searches. The FBI and local authorities continue to probe motives and target considerations.