The noise was reported in several areas of Burlington and Camden counties, police said.
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According to the Gibbsboro Police Department, the noise was traced back to Joint Base McGuire-Dix-Lakehurst, which had posted a notice of scheduled weapons training.
The weapons training could have included live mortar fire, howitzers and other high-powered weaponry.
Startled neighbors did not have any idea what was going on, resulting in several 911 calls.
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Joint Base MDL officials say they may continue this training operation Tuesday, Thursday and through the weekend.
"Throughout the month of May other scheduled operations will occur and bangs will be heard," Gibbsboro police said.
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