Pakistan Interior Minister Rahman Malik has thanked Home Minister P Chidambaram for the release of noted singer Rahat Fateh Ali Khan. The singer was detained by revenue enforcement authorities at the Delhi airport for allegedly carrying 1.24 lakh Dollars on Sunday.Sources said Malik telephoned Chidambaram today and thanked him for the release of the singer, who was freed from detention yesterday evening after questioning by the Directorate of Revenue Intelligence officials.Rahat, whose passport has been seized, has been asked to report to the DRI officials again on Thursday for further questioning.Carrying enormous amounts of money without declaration is an offence under customs rules and could attract charges under Foreign Exchange Management Act.