According to the LA Times, a man has been arrested for threatening to shoot up schools via Facebook. Via the LA Times:
Investigators received information about the Facebook post on Sunday, sources said. When officers arrived at the suspect's Northeast Los Angeles home about 2 p.m., they found numerous weapons inside.
The suspect was arrested on suspicion of making criminal threats. His name, age and address have not been released by authorities.
Following the mass shooting in a Connecticut school Friday, which left 20 children dead, LAPD Chief Charlie Beck announced daily dedicated patrols in Los Angeles schools to protect against potential shooters would begin when children return from their holiday break. Police departments in states across the country have put in place similar plans in the wake of the Newtown massacre.