Crews battled a multi-alarm fire at a sawmill in Greenfield on Saturday.The fire started around 1:20 p.m. at Kennebec Lumber Company on Sawmill Road, according to Southwest Mutual Fire Aid.About twenty towns were involved either fighting the fire, or covering other stations.Photos and video from the scene showed flames and a large plume of smoke coming from what appeared to be a pile of sawdust and wood pieces.The New Hampshire Department of Transportation said Sawmill Road, which is also state route 31, was closed in the area of the fire. Miles Higgins told WMUR he and his family were leaving a Greenfield Fire Department fundraising barbecue when they saw the smoke in the distance, and said they arrived before firefighters did."It was very large flames and it was spreading pretty quickly and the smoke, like we saw it from probably a mile away," Higgins said.In a Facebook post, Kennebec Lumber said it was sending a management team to the facility and would develop and action plan for those affected.The company also thanked the local first responders for their work.The fire was brought under control Saturday evening, and no injuries were reported.