Cops arrested a boy who allegedly stabbed another boy in the torso at Edward R. Murrow H.S. at 9:22 a.m. on Dec. 5.
The victim, 15, was in stable condition at Maimonides Medical Center.
The suspect, also 15, was charged with attempted murder, assault and criminal possession of a weapon.
CBS 2 News said the New York City Safety Coalition later seized 13 knives, seven pepper spray canisters, two stun guns and a box-cutter from the school.