Malaysia Airlines MH370: Confusion over plane last location
Search teams are scouring waters off both sides of the Malaysian peninsula, amid confusion over a missing Malaysia Airlines plane's last known location.
Malaysia's air force chief has denied reports that the plane was tracked to the Malacca Strait in the west.
Vietnam has scaled back search efforts, but despatched a plane to investigate a possible eyewitness report of something burning in the sky east of Vietnam.
Flight MH370 went missing on Saturday. It had 239 people on board.
Authorities have been searching for the plane, which disappeared en route from Kuala Lumpur to Beijing, for the past five days.
Earlier this week, Malaysia widened the search for the missing plane amid conflicting reports on its last known position.
'Burning spotted'
The Malaysian authorities initially said flight MH370 disappeared about an hour after it took off from Kuala Lumpur International Airport, as it flew over the South China Sea, south of Vietnam's Ca Mau peninsula. No distress signal or message was sent.
Early search efforts focussed on waters between Malaysia and Vietnam.
The search was later extended to the Malacca Strait and the Andaman Sea, off Malaysia's west coast, amid reports that the plane could have turned back.
On Wednesday, Malaysia's air force chief Rodzali Daud denied remarks attributed to him in local media that a missing Malaysia Airlines plane was tracked by military radar to the Malacca Strait, far west of its planned route.
Gen Rodzali Daud said he "did not make any such statements", but the air force had "not ruled out the possibility of an air turn-back".
On Wednesday, authorities also began searching the Andaman Sea, north of the Malacca Strait.
"We are not going to leave any chance. We have to look at every possibility," Malaysian civil aviation chief Azharuddin Abdul Rahman told AFP news agency, without indicating why the search was expanded north.
Meanwhile, Vietnam said it was scaling back some of its search activities, but had deployed aircraft to investigate a possible sighting of the plane.
Doan Huu Gia, deputy general director of Vietnam's air traffic management, said: "We received an email from a New Zealander who works on one of the oil rigs off Vung Tau.
"He said he spotted a burning at that location, some 300 km (200 miles) southeast of Vung Tau."
Officials still do not know what went wrong with the aircraft, and several leads pursued so far have not been proven to be linked to the plane.