Two teenaged gunmen recently opened fire at the Islamic Center of San Diego, killing a security guard and two staff members before being found with fatal self-inflicted wounds in a nearby vehicle. Like so many recent extremist mass shootings, they livestreamed the attack and, uniquely, even livestreamed their suicides. Police say one shooter’s mother had earlier reported him missing, suicidal and in possession of stolen firearms from her home. The attack is being investigated as a hate crime af