SAN DIMAS, Calif. (AP) -- The Los Angeles County Sheriff's Department is trying to find a cyberbully who sent Instagram death threats to a girl at a suburban school. Students at Lone Hill Middle School in San Dimas wore blue Friday in support of the student. Students notified school officials this week about the threats. One anonymous posting warned the student: "This is your last week. Time's up!!" Another had a photo of the girl with the caption: "That smile! I can't wait until it's just blood and tears!" And another showed a knife with the caption: "Here is your new friend." School officials say the girl was sent home with her mother and won't return until it's deemed safe. Classes continue but sheriff's deputies are on campus during school hours as a precaution.