SEOUL -- Seven people were confirmed dead on Sunday after a South Korean chartered fishing vessel collided with a tanker and capsized off the coast of Incheon, South Korean Coast Guard said.

The Coast Guard added that two people remain missing and six others are still unconscious.

Local media reported that the 9.77-ton boat, with two crew members and 20 passengers on board, collided with a 336-ton tanker in the waters near Yeongheung Island, west of Seoul, at around 6:12 a.m. (local time) on Sunday.

South Korean authorities have mobilized four helicopters and 14 boats for the rescue operation.