Kalmadi, the chairman of the Games Organising Committee, arrived mid-morning at the headquarters of the Central Bureau of Investigation (CBI) in New Delhi, where detectives quizzed him over suspect contracts.

The Games, which were marred by venue delays and poor organisation, were also hit by claims of massive financial irregularities as the budget ballooned to an estimated $6 billion (£4 billion).

Last month raided several residences used by Kalmadi but CBI has complained to the Government that Kalmadi and his closest aide, Lalit Bhanot, were obstructing their investigation.

Police have questioned a number of senior Games officials, including Bhanot, and have charged three lower ranking officials.

The police corruption probe has so far focused on contracts awarded for a ceremony in London to mark the start of the Queen's Baton Relay in October 2009.

The CBI has also charged sports timing company Swiss Timing, which has worked on a host of Olympic and Commonwealth Games, over alleged kickbacks contained in a contract it won to provide the official timing for events.

The national anti-corruption watchdog, the Central Vigilance Commission (CVC), has received complaints alleging up to $1.8 billion (£1.1 billion) of Games money was misappropriated.

A initial report by the CVC into the Games confirmed the use of sub-standard construction materials in a host of Games-related building contracts and deliberate cost overruns.

Prime Minister Manmohan Singh, whose reputation for probity is on the line over his handling of recent party corruption cases, set up a panel after the Games concluded to investigate graft claims.

It is expected to deliver its preliminary report later this month.

Two other Government bodies are also running separate probes, including the tax department which has inspected companies that supplied sports surfaces, training equipment and landscaping for the Games.


Related stories
December 2010: CBI to question Kalmadi over Commonwealth Games corruption allegations
December 2010: Kalmadi claims he has nothing to hide after raid on homes
December 2010: Kalmadi homes raided over Commonwealth Games corruption allegations
December 2010: "Prisoners given weapons to kill Commonwealth Games officials" it is claimed
December 2010: Exclusive - Fennell backs investigations into Delhi Commonwealth Games corruption