Days after adolescent rooftop snipers terrorized a Brooklyn neighborhood with darts from a blow gun, a different duo of teenage punks sprayed a Lower East Side street corner and schoolyard with BB pellets as pupils studied inside, police said.

No students were injured during the 1 p.m. attack yesterday, but custodian Cleveland Williams was hit in the right leg with a pellet as he was taking out trash.

“As soon as they shot it, it stung, and I looked around and I saw nobody,” Williams, 34, told The Post.

He was treated at the scene.

Cops responding to a call of shots fired cautiously approached a building across the street from PS 2 on Henry Street.

They knocked on a second-floor door, and when it was opened, they spotted a BB rifle on a living-room table, police said.

They also found a second rifle, nunchucks, knives and a dart-blow gun, which had no connection to the weekend Brooklyn attack.

“The officers observed the stock of a rifle in plain view on the living-room coffee table,” a source said.

Cops arrested two teens, a 14-year-old who lived there and his 15-year-old suspected accomplice.

Principal Brett Gustafson said he was relieved the custodian wasn’t more seriously injured.

“It wasn’t a major injury, but there is a concern that it happened at all,” Gustafson said.

Gustafson said police have been called to the school three times in the past two months over similar incidents.