No passenger from Chinese mainland aboard the missing MH370 flight might be involved in hijack or terror attack, Chinese ambassador to Malaysia said on Tuesday.

Background check on all passengers from Chinese mainland has found no evidence to support that suspicion, Huang Huikang said.

He also said China has started search in the its territory along the northern corridor.

Based on latest information, the new search areas encompass a northern corridor stretching approximately from the border of Kazakhstan and Turkmenistan to northern Thailand, as well as a southern one from Indonesia to the southern Indian Ocean.

Malaysia Airlines flight MH370 went missing in the early hours of March 8 en route from Kuala Lumpur to Beijing. There were 239 people on board, including 154 Chinese passengers.

A multinational search has so far failed to determine its whereabouts, and what happened to the plane remains a mystery.