The government cannot make light the failure of its radars to track Malaysia Airlines flight MH370 as the aircraft could have been used in a terrorist attack like the Sept 11, 2001 attacks on the US, said Lembah Pantai MP Nurul Izzah Anwar.

As such, Nurul Izzah called on the government to have the International Civil Aviation Organisation's (ICAO) audit the country's commercial radar system, particularly in regards to the newly built KL International Airport 2 (KLIA2).

"This matter cannot be taken lightly as it involves the safety of passengers on the aircraft as well as national security.

"The 9/11 attacks comes to mind as the attacks were carried out using civilian aircraft," she said in a statement today.

In that notorious incident, two civilian aircraft were hijacked and crashed into the World Trade Centre in New York.

A third crashed into the Pentagon, Virginia while a fourth said to be aimed at the White House was foiled by a passenger revolt and crashed onto the plains of Pennsylvania.

More than 2,900 people in total were killed in the attacks including passengers on all four aircraft.

Nurul Izzah also quoted from the preliminary report on the MH370 incident released on Thursday, which revealed that military aircraft spotted what was believed to be the plane but took no action.

'Unidentified aircraft not tracked?'

"The question is, if it was Flight MH370, why was it not identified much earlier and if it wasn't MH370, is it a norm that any aircraft which origin is unknown could just fly through Malaysian airspace?" she asked.

Nurul Izzah said she hopes the preliminary report will prompt the government to improve the country's radar systems.

"The acting Transport Minister (Hishammuddin Hussein) had in mid-April also stated that ICAO will conduct an audit on the safety of KLIA2.

"I urge the minister to release the report of that audit by ICAO as soon as possible. At the very least, it should be tabled in Parliament," she said.

The Beijing-bound MH370 went missing not long after taking off from KLIA in the early hours of March 8, carrying 12 crew members and 227 passengers.

It remains lost after 57 days of search in the Indian Ocean, which is believed to be the aircraft's last known location based on satellite calculations, and the cause of the diversion remains a mystery.