This provided photo shows an Air Force An-2 propeller-driven biplane lying in a stream in the southeastern city of Andong on Feb. 4, 2016, after making an emergency landing. The two crew members walked out of the stricken plane, apparently unharmed, military sources said. Authorities said engine problems may have forced the Russian-made plane out of the sky, although the exact cause of the mishap needs to be identified. (Yonhap) (END)