Mesa police investigating school threat

MESA, Ariz. (FOX 10) - Mesa police are investigating a school threat after they received a tweet from someone who claims they are going to bring a loaded AR-15 and explosives to a Valley school. According to the Mesa Police Department, the person who posted the original message claims to be 16-years-old and will be going to school with a loaded AR-15. The person also claims seven custom-made explosive pipe bombs have been already planted around the building.