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The search area for the missing MH370 plane has narrowed and will be at "a critical juncture" in the next two days, says Malaysia's acting transport minister, the BBC reports.

Hishammuddin Hussein said an underwater drone would finish searching the area within the next week.

The Bluefin 21 mini-submarine has so far found nothing after six missions.

Malaysia Airlines flight MH370 went missing in March as it flew from Kuala Lumpur to Beijing carrying 239 people.

The Bluefin is mapping the area of the sea bed within a 10km (six miles) radius of where acoustic signals were detected believed to have come from the aircraft's flight recorder.

It is operating at a depth of more than 4,000m (13,000 feet).

Mr Hussein said it was important to focus on the search on Saturday and Sunday.

"The narrowing of the search for today and tomorrow is at a critical juncture," he said.

"I appeal to everyone around the world to pray and pray hard that we find something to work on in the next couple of days."

Using satellite data, officials have concluded that the MH370 ended its journey in seas west of the Australian city of Perth.

They do not know why the plane flew so far off course and finding the plane's flight recorders is seen as key to understanding what happened.