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MILFORD TOWNSHIP, Pa. (CBS) — Authorities are investigating another mysterious explosion in Bucks County, this time after a tractor mowing grass struck a device.

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Pennsylvania State Police say a Milford Township road crew member was cutting grass along Brick Tavern Road on Thursday when the tractor he was operating ran over the device, creating an approximately 1-foot-wide by 3-inch-deep crater.

The township worker was not hurt and there was no damage to the tractor.

“I’m very concerned, I’ve been concerned for a while,” said neighbor Lisa Bernstein.

Bernstein says she has called police numerous times in the past few months after hearing other explosions, usually between 1 and 4 in the morning.

“Yesterday, it was called in right away because most people in the middle of the night don’t hear it. Me, it will wake me right out of bed,” she said.

An explosion nearby on Brick Tavern Road rocked her house last Sunday.

“It’s scary to me,” said Bernstein. “It’s right in my backyard.”

Police believe this incident is connected to other mysterious explosions that have been rattling Bucks and Lehigh Counties.

Authorities say more than 20 explosions during the early-morning hours are the reason for the booms happening in the area since April 2.

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Federal agencies are also assisting in the investigation.

To date, police say no one has reported any injuries related to the explosions.