Annoyed over conflicting reports about the missing plane, China tonight asked Malaysia to verify rumours and share all information about the flight MH370 after official admission that it may have turned back and disappeared over the Straits of Malacca.

"We have send requests to the Malaysian side through diplomatic channels, asking them to check up on rumours right away and inform China of all information available," Foreign Ministry spokesman Qin Gang said in a statement.

Qin's remark came after a Malaysian military official said the missing flight may have changed route and turned back from its scheduled course before disappearing last Saturday.

Anxieties mounted in China as 154 of the 227 passengers are Chinese and their relatives are annoyed over the confusion and lack of progress even five days after the incident.