A Kansas City apartment building that collapsed, killing two firefighters, was still burning 12 hours after the blaze began.

Fire Chief Paul Berardi says two other firefighters were injured Monday night as the massive fire engulfed the building on the city’s northeast side. Berardi says the two who died saved two residents shortly before the building collapsed around them. He says they “did not die in vain.”

Two others firefighters were injured.

The building, located near the intersection of Independence Avenue and Prospect Avenue, began to collapse at 8:07 p.m., some 35 minutes after the residents were pulled from the building.

A mayday call was issued and all firefighters were ordered from the building due to the dangerous conditions. Unfortunately, some of the firefighters didn’t make it out.

Kansas City Fire Chief Paul Berardi on Tuesday morning identified the fallen firefighters at Larry Leggio, a 17-year veteran, and John Mesh, a 13-year veteran.