Authorities say the two teenagers who shot and killed three people in an attack on a California mosque had been radicalized online where they first met. Investigators said Tuesday that the pair shared white supremacist views and left behind writings showing their hatred toward various races and religions. Authorities also found at least 30 guns, ammunition and a crossbow at two residences after Monday’s attack. Authorities praised the security guard at the Islamic Center of San Diego and two other men who were killed for slowing the attackers. They say the victims helped stop the attackers from reaching schoolchildren just steps away. Police have said the shooters killed themselves.