Authorities in Pennsylvania are asking the public to “be vigilant” after a string of mysterious blasts in the area over the past two months.
The incident on Thursday is believed to be connected with other events in Bucks County, where there have been more than 20 early-morning explosions since April 2, FOX News reports.
“Our main goal is keeping the public safe and apprehending the subject(s) responsible for these events,” police said.
Police have previously said that no one has been injured since the explosions began, but the events “disrupt emergency response personnel from their normal course of duty, straining local resources and impeding emergency personnel from responding to other calls for service.”
Residents across the area have reported booms loud enough to rattle windows and shake walls taking place between 1 and 4:30 a.m. and waking them up.
“It’s just like a boom. That’s just how it sounds,” Donna Weaver told FOX29 at the end of April.
Weaver, a resident of Quakertown, said she heard the booms several times over the course of the month, which woke her up in the middle of the night.
“I don’t know and it’s kind of scary,” she told FOX29. “Because I thought of thinking maybe it’s underground, maybe underground somewhere.”
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Pennsylvania State Police are asking people to report “any suspicious items or activity” and those with information to call Lehigh Valley Crime Stoppers at (800) 426-TIPS.