The leak occurred in a suite on the second floor at 1201 Locks Rd. near Wootton Parkway in Rockville shortly before 9:50 a.m., MCFRS Spokesperson Pete Piringer said.
The building was evacuated as HazMat crews responded to investigate and provide ventilation.
The leak was contained a short time later, Piringer said.
Further details were not immediately available.
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