ROUGH CUT (NO REPORTER NARRATION).<br/> <br />STORY: Fire fighters in Seoul doused the smouldering wreckage of a helicopter on Saturday (November 16) after it collided into an apartment building and fell to the ground.<br/> <br />Gangnam Fire Station said the chopper, owned by South Korea's electronic giant LG Electronics Inc., crashed into the upper section of the high-rise building in Gangnam area at around 8:45 a.m.(2345GMT Friday), due to loss of visibility amid thick fog.<br/> <br />The accident left the two pilots dead and 27 residents of the apartment were evacuated without injury, the fire station said.<br/> <br />Gangnam is Seoul's richest district whose affluence was parodied in Korean rapper Psy's hit song.