LEOMINSTER — A six-alarm blaze tore through the old Columbia Hotel in the heart of this north central Massachusetts city late Saturday night, injuring two firefighters when a portion of the building collapsed, a fire official said.

Fire Chief Robert Sidleau said the fire began around 10 p.m. in the front portion of the building at 65 Main St. The building houses 20 apartment units as well as businesses including an arts center, a tavern, and a newspaper office.