India's Central Bureau of Investigation had summoned AirAsia Group CEO Tony Fernandes to present himself in India on June 6, reported Times of India today.

The report quoted sources familiar with the investigation saying that a notice for appearance had been sent to Fernandes via email but it is not known whether he has responded to it.

This comes two days after CBI accused AirAsia of corruption, some of its employees and third parties of violating foreign direct investment rules while obtaining its licence to fly, and of bribing government officials in an attempt to get regulations relaxed to allow AirAsia India to fly international routes.

The airline has called denied all accusations, calling them "baseless and motivated by considerations that as yet remain unknown", and said it would defend itself to the fullest extent of law.

According to the Times of India report, Fernandes is needed to be questioned regarding the Foreign Investment Promotion Board (FIPB) approval taken by the company for investing in India and his alleged efforts to get the 5/20 rule of civil aviation policy changed, so that AirAsia could start international operations.

"He is also accused of pressurising former AirAsia India CEO Mittu Chandilya to pursue changes in regulatory policies for international aviation in India suitable to the company.

"Officials refused to say whether Fernandes had replied to the CBI’s summons yet. The agency is also likely to soon issue summons to Malaysia-based deputy group CEO of AirAsia Bo Lingam and AirAsia India director Venkatramanan Ramchandran. FIPB and civil aviation ministry officials, who handled the AirAsia file in 2013-14, will also be called to CBI headquarters for questioning," said the report.

CBI had alleged that AirAsia had used lobbyists to get the 5/20 rule, which pertains to a domestic airline being allowed to fly overseas only after completing five years of domestic operations with a fleet of at least 20 aircraft, removed or amended, before the 2014 Indian general election.