Seven of the injured were in serious condition, said Byeon Tae-u of the Incheon Fire and Safety Management Department. He said the number of injured could increase.
Park Sang-yeoul, an official from the Incheon Seobu Police Station, said the damaged cars had been removed from the 4,400-meter (14,400-foot) cross-sea bridge on the highway from the airport to the capital, Seoul.
He did not have the exact number of vehicles involved in the accident, but said it was about 100.
Lee Gyeong-hoon, a 39-year-old driver whose car was involved in the crash, said he was driving slowly because the fog prevented him from seeing much more than 10 meters (yards) ahead.
"I saw the brake lights of the car in front of me turn on and I stopped abruptly," said Lee, whose car was hit from behind. He was able to open the door and escape to the side.
In 2006, a 29-car pileup in foggy weather on another cross-sea bridge in South Korea left 11 people dead and more than 50 injured.
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