CRI听力:Malaysian PM Ends Trip to Perth

The search is continuing for the missing Malaysia Airlines flight, as Malaysian Prime Minister Najib Razak ends his trip to Australia.

CRI's Alexander Aucott has more.

Reporter: The prime ministers of Australia and Malaysia have promised to do everything possible to find the airliner, which has been missing for about a month.

Following a meeting with his Malaysian counterpart in Perth, Australian Prime Minister Tony Abbot says efforts to refine the search area will not stop.

"Every day working on the basis of just small pieces of information, we are putting the jigsaw together and every day we have a higher degree of confidence that we know more about what happened to this ill-fated flight."

Abbot also appealed to the families of MH370 passengers to be more patient after more ships joined the search in southern Indian Ocean.

For his part, Malaysian Prime Minister Razak is promising not to give up the hunt despite the difficulties.

"I know that until we find the plane, many families cannot start to grieve. I cannot imagine what they must be going through, but I can promise them that we will not give up."

Razak visited Australia to see for himself how the search mission is progressing.

Some eight planes and nine ships, including seven Chinese vessels scoured the search area on Thursday.

Chinese authorities say a total of 18 vessels, 8 helicopters and 3 aircraft have taken part in the search since the flight went missing.

A British submarine has already arrived in the southern Indian Ocean to assist in the multinational operation.

An Australian navy ship with equipment for detecting the plane's black-box flight recorder is heading to the region.

Experts have warned that the battery power of the flight recorder could run out after 30 days.

But the Malaysian civil aviation authority has stated the black box will be found.

Meanwhile, a criminal investigation is going on over the disappearance of the flight.

Earlier, investigators cleared all passengers of possible involvement.

The police say they have conducted over 170 interviews with family members of the plane's pilots and crew members.

They are now looking into the cargo and food served on the plane in case of sabotage.

For CRI, I'm Alexander Aucott.