The Supreme Court today asked the Delhi Police to trace the source of money used to allegedly bribe some parliamentarians ahead of a confidence vote in Lok Sabha in 2008.

While asking police to trace the source of the funds, a bench of justices Aftab Alam and R M Lodha, however, refused to monitor the case further, saying the charge sheet in what is known as the cash-for-vote scam has already been filed in the court.

"The objective has been achieved. Everything should be left to concerned criminal court which is hearing the case. We were on minor aspect. Who were involved and in what manner is to be decided by the court (trial court)," the bench said.

Former Chief election commissioner J M Lyngdoh on whose plea the apex court had issued a slew of directions in the scam pleaded the matter should not be disposed of and the apex court keep the matter pending.

The court, however, was not convinced with the plea and said he can approach it at any stage when its intervention is required.

Delhi Police also assured the bench that the probe will be completed within four weeks.