Pic: AP.

KUALA LUMPUR, Malaysia (AP) — A Vietnamese official says searchers on ships worked throughout the night but could not find a rectangle object spotted Sunday afternoon that was thought to be one of the doors of a missing Boeing 777.

Doan Huu Gia, the chief of search and rescue coordination center, said Monday that six planes and seven ships from Vietnam were searching for the object but nothing had been found.

Malaysia Airlines Flight MH370 went missing early Saturday morning on a flight from Kuala Lumpur to Beijing with 239 people on board.

The plane lost contact with ground controllers somewhere between Malaysia and Vietnam, and searchers in a low-flying plane spotted an object that appeared to be one of the plane’s doors, the state-run Thanh Nien newspaper said.