By Lisa Gresci

SOMERVILLE (CBS) – Two firefighters were hurt saving two grandparents from a house fire in Somerville early Wednesday morning.

Fire Chief Charles Breen said flames broke out in the basement of the home on Kensington Avenue overnight.

READ MORE: 'It May Take Several Weeks' For Newly Eligible Massachusetts Residents To Book COVID Vaccine Appointment, Baker Says

“I woke up and there was smoke all over the place,” 18-year-old resident Peter Lancaster told WBZ-TV. He ran out of the house with his three younger siblings, but his grandparents never came out behind them.

“Upon arrival we had heavy fire conditions in the basement spreading up the rear stairway. Two older occupants trapped on the second floor in the rear, they were rescued over ladders,” the chief told reporters.

READ MORE: Lowell COVID Vaccine Clinic Shifts To Pfizer Doses After Johnson & Johnson Pause

Lancaster said his grandparents are expected to be ok.

Breen said two firefighters were hurt during the rescue. Both were taken to Massachusetts General Hospital with non-life-threatening injuries.

MORE NEWS: Massachusetts 'Eagerly Awaiting' Further Guidance On Johnson & Johnson Vaccine

There’s no word yet on what caused the fire. The chief said there is extensive damage in the two story home.

Lisa Gresci