A school bus packed with school boys between the ages of six and 11 rolled down a hill and crashed into a house in a suburb north of New York City Thursday morning, causing serious injuries.

The wreck in Spring Valley occurred after a bus operated by the Jewish Ribnitzer schools struck two parked cars, dragging them over a hill before slamming into a home on Southgate Drive in Spring Valley, according to the Yeshiva World.

Nearly two dozen patients — 21 children and the driver — were extricated from the wreckage, with six taken to the pediatric trauma center at Westchester Medical Center, where two of them were in serious but not life threatening condition, a first responder on the scene told The Post.

“They’re in great medical care right now and we certainly wish them a speedy recovery,” said Rockland Hatzolah EMS captain Josh Hans.

Two other children were being treated at Nyack Hospital and the driver was at Good Samaritan Hospital in Suffren, Hans said.

It was unclear what set off the freakish crash, or if there was an arrest. Ramapo police were leading the investigation, according to Spring Valley authorities.

First responders and school officials from the Hasidic community were also at the crash scene.

“Our primary concern was obviously for immediate life threats to all patients, and especially with a school bus, we want to make sure that all patients are accounted for,” Hans said.

“In any car accident, you might know how many family members or people you’re traveling with, but with a school bus, it can get confusing.”

Near the scene, a mother told reporters her 10-year-old son was taken to the hospital to be evaluated following the crash, but luckily suffered only bruising on his leg and had no serious injuries. 

“He tried one emergency window but he said there was a car turned over right there so he couldn’t jump out right there,” said the woman, who was holding another young child and declined to share her name.

“So he tried to find the next available one, and he said he was waiting on line, my little boy. He was waiting on line to be able to jump out.”

Other children with minor injuries were fully evaluated by paramedics and then released back into the care of the school, which sent administrators and another bus to the scene, Hans said.

“It was quite chilly this morning, so one of the neighbors was kind enough to allow all of these kids to come into the house to be seen and evaluated, rather than in 30-degree weather in the street,” said the first responder. 

“Thankfully, it wasn’t chaotic. They weren’t crying.”