NEW YORK (CBSNewYork) — A 13-year-old boy was arrested after police accused him of giving his 8-year-old brother a loaded gun that he brought to school.

Investigators said the younger brother took the gun to P.S. 91 The Albany Avenue School, at 532 Albany Ave. in Crown Heights, Brooklyn, on Friday during Spirit Day. The boy was discovered with a loaded .380 Taurus handgun, police said.

The children were in the schoolyard enjoying the nice day when the teachers asked the children to sit on their book bags, but one of them refused. He was acting strange, and they questioned him and opened the book bag.

In it, they found the gun with four bullets in the clip.

Police questioned the boy at the 71st Precinct, 1010 WINS’ Samantha Liebman reported.

The 13-year-old faces charges of criminal possession of a weapon.