This is what happens when prejudice meets boredom and insanity.

The man who constructed a never-before-seen launcher that fired a projectile into the roof of a building adjacent to a Jewish outreach center in Santa Monica, Calif., is a transient known in Los Angeles for towing a trailer full of possessions behind a bicycle, police sources said.

via Santa Monica Synagogue Attack: Police Say Transient Made Improvised Launcher – ABC News.