A criminal investigation is now underway after officials said Monday afternoon they believe the fire was intentionally set.
The fire broke out at the Diyanet Mosque on Middletown Avenue in New Haven on Sunday.
It's currently the holy season of Ramadan.
"Because it’s a house of worship, and what’s going on in our nation right now, we want to make sure the state police is on scene paralleling this investigation," said Chief John Alston, New Haven Fire Department.
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