The Wallkill Valley Regional High School in Hardyston will stay closed until further notice because of damage after a house across the street exploded Tuesday night.

The explosion "obliterated" the house, and all that remained were piles of debris that landed in people's yards up to two miles away, Hardyston Police Chief Bret Alemy said. The owners and neighbors of the home on Grumm Road and emergency personnel were not injured by the explosion.

The school will remain closed as investigators assess the seriousness of the building's facade, window and door damage.

Alemy said the owners of the home were not at the house at the time of the explosion. Grumm Road remains closed as investigators continue probe why the house exploded, despite reports of a confirmed cause. Authorities said that a propane tank might have caused the explosion.

Much of the debris was found in a southeast direction, he said.

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The explosion could be heard in surrounding towns. Residents in Rockaway Borough, 20 miles away, could feel the explosion and the Hardyston Police Department also felt it, said Alemy.

People in a Wanaque Facebook page said it could be heard there and in West Milford.

Dan Schenker of Hamburg said he had fiberglass on his street 2 miles away.

"It felt like a bomb went off," Schenker said. "Our whole house shook. My wife Caity ran outside and saw fiberglass insulation floating down onto our road, so we figured whatever happened was pretty close."

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The explosion came at about 11 p.m.. The high school was not the only building to suffer damage. A neighboring house had some window damage, according to the fire department.

Some thought it was an earthquake.

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