Police have arrested a suspect wanted for a crime that NYPD Commissioner Bill Bratton called “the height of insanity’’ Tuesday — the shooting of five teens over a backpack in Brooklyn.

Bernard Bellony, 21, showed up at the Harry Maze Park in East Flatbush with a gun Monday after his little brother told him that a group of teens took his expensive designer backpack around 4:45 p.m., cops said.

The younger brother said he had put the bag on the ground while playing basketball but when he went back to the spot where he left it, it was gone.

Bellony confronted the suspected thief, pulling out the gun a firing at him, police said.

But instead of hitting his target, the gunman struck five other teens standing nearby.

Two 17-year-olds were grazed in the torso, two 16-year-olds were struck in the right leg and cheek respectively and a 15-year-old was shot in the hand.

All were treated at Kings County Hospital. Cops searched through the night for the shooter before catching up with Bellony at his parole office Tuesday morning.

He served two years in prison for a weapons possession charge before being released in March.