An unidentified plane has crashed to the ground and exploded in Zhejiang province near Lishui city,eastern China late Monday amid heavy fog, the China National Radio said Tuesday. The police quickly sealed the site off to the public and no details about potential casualties or the cause of the crash were made available. The Beijing News quoted locals as saying they had seen something that looked like a plane crash on a hilltop and explode. One official at the scene said the plane was not a civilian aircraft, the report said. The defence and agriculture ministries were not immediately available for comment.