A civilian helicopter crashed at NATO's largest base in southern Afghanistan on Sunday, while a U.S. military helicopter made an emergency landing in the east, officials said. It was not immediately known whether the helicopter crash at Kandahar Air Field caused any casualties. U.S. military spokeswoman Lt. Cmdr. Christine Sidenstricker said there was no indication that insurgent fire was behind the crash. No other details were immediately released, the Associated Press reported. In the east, a U.S. military helicopter made an emergency landing in Kunar province, the military said in a statement. Sidenstricker said no enemy fire was reported near the helicopter. Personnel on the helicopter were taken to a medical facility for treatment, but no other details were released.