Crews remain at the scene of a hazmat situation in downtown Boston after a steam line rupture sent an unknown debris spraying into the air early Saturday morning, police and fire officials said.
Boston Fire Department spokesman Brian Alkins told The Boston Globe that officials were concerned the substance may be asbestos.
A statement from Veolia North America says its crews are monitoring the air for hazardous material and that all samples have been negative.
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The Boston Fire Department responded to the level 2 hazmat situation around 5:30 a.m. Saturday in the area of 99 Summer Street, fire officials say. The area was quickly contained, and the leak shut down.
Hazmat technicians remained on scene throughout the day to monitor the area.
There was no immediate word on any injuries.