China urges Malaysia to intensify search for flight MH370

China has urged Malaysia to "step up its efforts" in the search for the Malaysia Airlines passenger plane that disappeared on Saturday.

Malaysia said it was widening the hunt, after days of searching found no trace of the plane or the 239 people on board - most of whom were Chinese.

Rescue teams from nine countries will now scour areas stretching from the Malacca Strait to the South China Sea.

Beijing-bound flight MH370 vanished shortly after it left Kuala Lumpur.

Relatives of the missing passengers have been told to prepare for the worst.

Chinese foreign ministry spokesman Qin Gang had earlier urged the Malaysian authorities to sharpen its search efforts.

"We have a responsibility to demand and urge the Malaysian side to step up search efforts, start an investigation as soon as possible and provide relevant information to China correctly and in a timely manner," he said.

Patience appears to be wearing thin in the search for the missing aeroplane, says the BBC's Celia Hatton in Beijing.

The Malaysian authorities are attempting to address Chinese concerns - they have reissued a pledge to fly worried family members to Kuala Lumpur so they can be closer to the search efforts, our correspondent adds.

But one victim's relative - Guo Qishun, whose son-in-law was on the plane - said he did not see the point of flying to Malaysia.

"If we go to Malaysia, we can do nothing but wait, just like we are doing in Beijing now. If we go to Malaysia, who can we rely on? Most of us don't speak English," he told the Associated Press news agency.