Federal agents are investigating a fire that roared through Healdsburg's downtown post office Saturday evening.
The smoke has cleared from the blaze, but it is still unclear how much mail was destroyed in the fire. Late Sunday the Press Democrat reported there is hope that some of the mail that was inside the building might be saved.
Agents from the federal Bureau of Alcohol, Tobacco, Firearms and Explosives were on the scene Sunday, leading the investigation into the four-alarm fire.
The blaze, first reported about 5:30 p.m. Saturday, sent black smoke pouring into the air. Firefighters were able to put the fire out by midnight, but remained on the scene overnight.
Healdsburg's acting fire chief, Steve Adams, says the fire was difficult to fight because it made its way into the roofline of the building.
Two firefighters were hospitalized with what was described as non life-threatening injuries.