The Nashua fire chief described Monday's response to a gas leak, explosion and fire as a "complete success," even though three firefighters were injured, because everyone in the building was able to get out safely.

Ice may have damaged a gas line, causing a Nashua, New Hampshire explosion. Now the fire department is issuing a warning about ice on roofs.

Three firefighters were injured when a natural gas leak caused an explosion and fire at a New Hampshire mental health center, but the building’s tenants and clients all evacuated safely.