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SEOUL, Nov. 16 (Yonhap) -- A helicopter on Saturday crashed into an apartment building located in the affluent southern part of the capital amid thick fog, leaving two people aboard dead, fire fighters said.

At around 8:55 a.m., the helicopter collided into the upper section of the posh high-rise apartment building located in Samseong-dong before falling to the ground, according to fire fighters.

The accident left the two pilots dead while no residents of the apartment were harmed as they were mostly evacuated, according to the authorities.

"It seemed that the helicopter lost visibility due to the thick fog," said an official at the National Emergency Management Agency.

Police and fire fighters are seeking to retrieve the bodies from the debris of the fallen helicopter, they added. The collision damaged the outer wall of the building spanning the 21st to 27th floors.

They said that they are seeking to find the exact cause of the accident.

The helicopter is owned by consumer electronics giant LG Electronics Inc.

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The private helicopter hit several apartments near the top of the 30-storey building before plunging to the ground, said the National Emergency Management Agency.

Two pilots - the sole passengers of the aircraft owned by LG Electronics - were found dead. No residents of the building were killed or injured, an agency official told AFP.

"It appears that the pilots lost visual due to extremely foggy weather," said the official who declined to be named.

The helicopter was set to pick up an LG executive in Gangnam for a business trip to the southern city of Jeonju, Jeon Myeong-Wu, LG's PR executive said in an interview with the YTN news channel.

TV news footage showed windows broken and walls collapsed at the luxury apartment block and the crumpled wreckage of the helicopter with the LG logo.

Hundreds of police officers, rescue workers and soldiers have been deployed to help clear the wreckage and evacuate residents after the rare accident.

The upscale district of the South's capital -- home to high-end shopping malls and million-dollar apartments -- was made famous by last year's global hit song "Gangnam Style" by South Korean rapper Psy.

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