Pakistani singer Rahat Fateh Ali Khan and his manager Maroof have been slapped with a penalty of 15 lakh rupees each in connection with recovery of huge amount of foreign currency from them which stands confiscated. Official sources said today, the duo were to board a Dubai flight when the sleuths of Directorate of Revenue Intelligence detained them at Indira Gandhi International Airport in Delhi on February 13 with allegedly undeclared amount of USD 1.24 lakh dollars and some other instruments too in foreign currency. They will be allowed to leave the country after they pay the penalty imposed on them by the Customs Department. The foreign exchange will however remain confiscated. After completing its probe, the DRI has charged them with violating provisions of the FEMA and Customs Act and sent the matter for adjudication to Customs.The Customs department imposed the penalty but they have not paid the penalty yet.