BEIJING, May 27  -- A Vietnamese fishing boat capsized after harassing and colliding with a Chinese fishing boat in the South China Sea at around 5 p.m. Monday, a source with the Chinese government said on Tuesday.

Crew aboard the boat were saved after their ship jostled a fishing boat from Dongfang City in southern China's Hainan Province and overturned in the waters near China's Xisha Islands, according to the source.

Vietnam has sent a number of ships to obstruct the drilling of Chinese companies in the waters where the collision took place. The Chinese side has taken measures to stop Vietnamese interference and lodged serious representations to the Vietnamese side, asking them to immediately stop the disruptive activities, according to the source.