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Baltimore firefighters battled a three-alarm fire caused by a possible explosion that seriously injured two children and three adults.

Fire officials said it happened around 10 p.m. Sunday in the northwest part of the city and involved five rowhouses.

Witnesses told WJZ-TV they heard a noise that sounded like a sonic boom and said they believed it may have been a gas explosion.

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Baltimore Fire said it was on the scene of a 3-alarm fire with a possible explosion Sunday.

Baltimore Fire said it was on the scene of a 3-alarm fire with a possible explosion Sunday. (Baltimore Fire Department)

Baltimore Gas & Electric issued a statement Monday saying crews conducted tests that found no gas leaks in lines leading to the homes.

“BGE’s records for this area show no recent leaks, no repairs or active project work and no gas odor calls in the last 12 months,” utility officials said.

“I heard a boom,” a woman named Jacqueline told WJZ. “It shook everything. I thought it was an earthquake or something.”

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Baltimore Fire said the fire Sunday night involved five row homes.

Baltimore Fire said the fire Sunday night involved five row homes. (Baltimore Fire Department)

Firefighters said the injured were in serious condition at hospitals.

It was in northwest Baltimore in August that two people were killed in a massive gas explosion that destroyed three rowhouses.

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The cause of the gas explosion remains under investigation.