It happened around Blossom Lane and Fleur lane, according to WFMZ.
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ATF officials tell Action News there was an explosion, but they can't confirm the type of device.
An eyewitness said he was cutting grass between 6:30 p.m. and 7 p.m. when he heard what sounded like an "explosion."
ATF investigating reported explosion in Bethlehem
A resident who lives outside where the explosion took place told WFMZ he was standing outside when a man driving a gray pickup truck tossed something out the window and it exploded.
No injuries have been reported.
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Bethlehem police and ATF are continuing their investigation.
Stay with Action News as we continue to follow this developing story.