A fire broke out on a fireworks barge in Plymouth around 9:30 p.m. Monday, during the town’s Fourth of July celebration, officials said, followed by a fire on a second barge.
No one was hurt in either fire. The Plymouth Police Department attributed the fires to a “malfunction” but did not provide details.
State Fire Marshal Peter J. Ostroskey, whose office is investigating, said the cause of the fires is not yet known.
Shane Sher, 41, of Fairhaven, was watching the show at nearby Stephen’s Field Park when he heard a noise he said he’s never heard before.
“Everything seemed to going fine for the first 10 to 15 minutes,” he said. “Suddenly there was a huge boom. Everything that was on display went up.”
Sher said that a fire on the barge appeared to linger for about 10 minutes.
“Periodically, you’d see a burst of fireworks,” he said.
Julia Nittler, 24, was staying at her family’s beach house across the bay when she said she heard a blast.
“It was really loud. The whole ground shook when it happened,” she said.
Rish Shadra, 18, of Hopkinton, said he thought the show was going as planned but had an unusually over-the-top ending.
“The fireworks were going off pretty normally, then there was a decently sized blast and what looked like a finale. A few minutes later, the barge was on fire,” Shadra said. “The fire boats got it out pretty fast though.”
Travis Andersen of the Globe staff and Globe correspondent Alexandra Koktsidis contributed to this report. Samantha J. Gross can be reached at firstname.lastname@example.org. Follow her on Twitter @samanthajgross.