Pakistan has sought the Commonwealth's cooperation in extraditing former President Pervez Musharraf from Britain after a court issued an arrest warrant for him in connection with the assassination of former premier Benazir Bhutto. Pakistan's High Commission in London has written to Commonwealth Secretary General Kamlesh Sharma to put pressure on Britain's Home Department to start criminal proceedings in British courts against Musharraf. The Express Tribune newspaper quoting sources said, an additional complication is Britain's obligations to humanitarian laws of the European Union, which abolished the death penalty within the grouping and prohibits extradition of suspects to countries where they are likely to face execution. Pakistan has already sent a request to Britain's Home Department for the extradition of Musharraf though legal experts believe the move is unlikely to receive a favourable response as there is no extradition treaty between the two countries.