More than 2,000 people are struggling to put out a forest fire that has been raging on a mountain to the northeast of Beijing, local authorities said Tuesday. Steep hills, strong winds and poor telecommunications have added difficulty to efforts to control the blaze, which started on a mountain in Chengde city, Hebei province, at about 1 p.m. Monday, Xinhua quoted a spokesman for provincial forest fire control authorities as saying. The cause of the fire remains unclear, he said.