FARMINGTON, Maine (AP) – Officials in Maine say a town’s fire chief is among the six injured in a propane explosion that killed a firefighter. State public safety spokesman Steve McCausland said after Monday morning’s explosion at a nonprofit center in Farmington that five people remain hospitalized. McCausland says an ambulance worker was treated and released. Town Selectman Scott Landry says one nonprofit employee is also hospitalized. Gov. Janet Mills is from Farmington, and her office says she knew the firefighter who died. She says she is sending her condolences. The explosion occurred after firefighters arrived to investigate the smell of gas at the recently constructed building. Farmington is about 70 miles north of Portland. Mills promises an investigation that will provide answers.