New Delhi, April 16 (IANS): Bharti Airtel chief Sunil Mittal and Essar Group promoter Ravi Ruia Tuesday appeared before a Delhi court following summons issued to them in a case relating to alleged irregularities in the allocation of 2G spectrum.

Both furnished separate personal bonds following a Supreme Court order. Accepting the bonds, Central Bureau of Investigation Special Court Judge O.P. Saini adjourned the proceedings till April 22.

The court said in the order: "It is submitted that vide order of April 15, the Supreme Court has been pleased to adjourn the matter to April 22. Accordingly, the matter is adjourned till April 22."

It further added: "It is further submitted that accused Sunil Mittal and Ravi Ruia were also directed to furnish personal bonds. Accordingly, both have furnished personal bonds and it is accepted till the next date."

The Supreme Court Monday posted till Thursday the pleas of Mittal and Ruia challenging the 2G special court's summons.

The apex court asked both Mittal and Ruia to appear before the trial court Tuesday and seek adjournment until April 22.

The special court had summoned the top executives to appear before it in connection with excess spectrum allocation scam during the Bharatiya Janata Party-led National Democratic Alliance regime in 2002.

The trial court had issued summons after taking cognizance of the chargesheet filed against mobile firms Bharti Airtel, Vodafone and Sterling Cellular for the alleged irregularities.