Two Chinese fishermen were missing and another in critical condition after their trawler capsized after colliding with a South Korean Coast Guard boat Saturday, officials said.

Four South Korean coast guard officers were also injured as they tried to arrest the crew of the Chinese fishing boat poaching 120 kilometers off South Korea's Eocheong Island, said the Coast Guard officials.

The Chinese fishermen attacked the Korean officers with iron pipes and clubs, they said.

The 63-ton Chinese boat capsized after ramming into the 3,000-ton Coast Guard ship, leaving two of its crew members missing. Eight other Chinese fishermen were rescued, but one of them was in a coma, the officials said.

The Coast Guard took the injured Chinese by helicopter to a nearby hospital for treatment. Six patrol ships, two rescue boats and four helicopters were dispatched to search for the missing, they said.

Illegal Chinese fishing is rampant in South Korean waters despite intense crackdown. In 2008, a South Korean Coast Guard officer was assaulted and drowned while trying to inspect a Chinese boat operating illegally in Korean waters.