Update 3:10 p.m.
Authorities say the building was ventilated. It is now safe and people were allowed back in.
There was no information available as to what the exact cause was.
Original 1:25 p.m.
PORTLAND — A building on Congress Street has been evacuated, according to the Portland Fire Department.
Crews are currently at 415 Congress St. investigating a carbon monoxide problem, a dispatcher said. At this time, it is unsure when people will be able to re-enter the building.
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