Two people suffered minor injuries after their small plane crashed in Stow on Saturday evening, a Stow Fire Department official said. The department was dispatched to Minute Man Air Field at 6:53 p.m., fire Lieutenant Barry Evers said. The aircraft crashed on the runway, he said, and the two occupants were taken to Emerson Hospital in Concord with injuries that were not life-threatening. The flight did not take off from Minute Man Air Field. Evers said he did not know where the plane came from. State Police and Stow police are investigating, said State Police Sergeant Tom Ryan.