Congress leader Jagdish Tytler was today questioned by the CBI in connection with the 1984 anti-Sikh riots case in which he was earlier given a clean chit by the agency.
The move came after a special CBI court in July had given the agency a last chance to complete its probe in two months in the case against Mr Tytler.
Mr Tytler today appeared before the investigation team where he answered questions put by the investigating officers, sources said.
Additional Chief Metropolitan Magistrate Shivali Sharma, while directing CBI to complete the probe, had made it clear that if there were no fruitful results in these two months, the agency's Superintendent of Police would have to explain.
The court's direction came when the CBI prosecutor filed a status report of ongoing probe and sought two more months to file the final report in July.
The court had on December 4, 2015, directed CBI to further probe the riots case against Mr Tytler, saying the statement of arms dealer Abhishek Verma had revealed an active role played by the Congress leader in extending "helping hand" to a witness against him.
The case pertains to the riots at Gurudwara Pulbangash in North Delhi where three people were killed on November 1, 1984, a day after the assassination of then Prime Minister Indira Gandhi.
CBI had re-investigated the case of killing of Badal Singh, Thakur Singh and Gurcharan Singh near the gurdwara after a court had in December 2007 refused to accept the closure report. CBI had filed three closure reports in the case.
Mr Tytler has denied any role in the riots.
