Lawyers have lodged an appeal with the Supreme Court against a high court judge's decision to detain a Nepalese man who was cleared of murder and robbery charges by a lower court.

The counsel for Govinda Prasad Mainali, 33, argued Tuesday that the detention of an acquitted suspect requires new evidence or information that would lead the court to question the earlier decision.

In Mainali's case, "there are no prerequisites that allow for such detainment," one of his lawyers said, adding that international conventions would allow an extradition request if he is found guilty by an appellate court following his departure from the country.