HO CHI MINH City, March 9 -- A Vietnamese helicopter discovered two oil slicks in waters off the coast of Vietnam, an official with the search operation confirmed Sunday.

The oil slicks were spotted at the suspected area where a China-bound Malaysia Airlines plane went missing, the official said.

A Malaysia Airlines Boeing 777-200 passenger plane with 239 people onboard, including more than 150 Chinese, lost contact with air traffic controllers en route from Kuala Lumpur to Beijing early Saturday.

There are still no confirmed information about the fate of the plane after about 36 hours passed.