New Delhi, May 2 (IANS): The Supreme Court Monday asked Delhi Police to explain what it had done thus far to probe bribery charges during a trust vote in parliament in 2008.

Delhi Police Commissioner B.K. Gupta was asked by judges Aftab Alam and R.M. Lodha to file a status report on the investigation into charges that MPs were bribed to back Prime Minister Manmohan Singh's government during the volatile voting in the Lok Sabha over the India-US nuclear deal.

The apex court also issued notice to the central government.

This follows former chief election commissioner J.M. Lyngdoh's submission that no investigation had been done into the bribery allegation by the Crime Branch of Delhi Police.

The investigation was handed over to Delhi Police after a parliamentary committee found the evidence of bribery charges unconvincing.

Senior Council Rajiv Dhawan, appealing for Lyngdoh, told the court that though three years had passed, no progress has been made in the case.