A mob scene unfolded at Oceanside High School on Mission Avenue Wednesday morning when about 200 students tried to leave campus, only to be blocked by police officers toting pepper-spray pellet guns and wearing riot gear. The scene at the campus subsided as school let out this afternoon and protesting students headed for the Oceanside Bandshell at the beach. Three boys have been arrested on suspicion of assault with a deadly weapon for allegedly throwing chunks of concrete at officers during the incident at the school. Tensions arose at the school just before noon, when several hundred students tried to...