MH370 Opposition Leader Anwar Ibrahim has accused Putrajaya of concealing information in connection with the loss of Malaysia Airlines Flight MH370.

With no trace of the plane being found after 28 days of search, Anwar said that while this was at least the result of "incompetence", there was also "intention to suppress key information".

"Unfortunately the manner in which this was handled after the first few days was clearly suspect," he is quoted as saying in an interview with UK-based newspaper The Telegraph .

Anwar ( left ) said information critical to understanding the incident appears to be missing.

“I believe the government knows more than us. They have the authority to instruct the air force… or Malaysia Airlines.

"They are privy to most of these missing bits of information critical to our understanding of this mysterious disappearance of MH370," he said.

In the interview, The Telegraph said Anwar indicated there was a possibility of officials on the ground being complicit in the incident.

However, he is quoted as adding: "The realms of possibilities are so vague, I mean anything can have happened... Whether they (authorities) are complicit in a terrorist act, I'm not in a position to comment."

Looking in the wrong place

Anwar also criticised Putrajaya for not acting faster in the early stages of the search by allowing Vietnam and China to expand on resources looking in the wrong place - the South China Sea.

He reiterated his assertion made in an earlier interview with CNN, stressing that the radar system which was purchased when he was deputy prime minister would have detected Flight MH370 when it suddenly made a turn back and flew across Peninsular Malaysia.

The Beijing-bound Boeing 777-200ER aircraft went missing over the Gulf of Thailand, not long after taking off from the KL International Airport in the early hours of March 8, with 12 crew members and 227 passengers.

The authorities have determined the plane intentionally made a turn back and altered its course shortly after cutting communications with tower controllers for unknown reasons.

Its whereabouts has now been narrowed down to the southern Indian Ocean, where at least eight nations are involved in a search some 1,700km north-west of Perth.