Two people were rushed to the hospital in critical condition from a large house fire in Manchester, New Hampshire, Friday, officials said.

About 100 firefighters were battling the blaze on Sullivan Street, Manchester Fire Chief Ryan Cashin said.

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He wasn't able to speak to witness accounts of people jumping from the building, but did say that when firefighters arrived, minutes after the 911 call at 7:41 p.m., they saw "heavy fire showing in all three floors."

Firefighters were seen on ladders working to put out flames, which sent heavy smoke into the air.

Cashin called it "a very challenging building," given how close other buildings were to it.

A dozen people are believed to have lived in the multi-family home.

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