A teenage boy is under arrest for threatening to shoot up his Bronx school.

Police say the 15 year old made the threat on the instant messaging app "Kik," saying he was sick of being bullied.

The boy is a student at the Bronx Center for Science and Mathematics in Morrisania.

He also allegedly tried to buy firearms online.

Police arrested him at his Fordham Manor home Wednesday night.

They also found a bulletproof vest carrier inside.

Police charged the teen with making terroristic threats.

He will be prosecuted as a juvenile.