Dubai - An international arrest warrant for the head of Mossad should be issued following the assassination of a Hamas militant in Dubai, the emirate's police chief has said. Lt Gen Dahi Khalfan Tamim directly accused Israel's Mossad intelligence agency of orchestrating the hit on Hamas commander Mahmoud al-Mabhouh. He said Interpol should now seek out those those responsible and called for "a red notice against the head of Mossad" to be issued. He said: "Our investigations reveal that Mossad is involved in the murder of (Mahmoud) al-Mabhouh. It is 99 percent, if not 100 percent, that Mossad is standing behind the murder." Israel has maintained its "policy of ambiguity" on security, refusing to confirm the involvement of Mossad, which is now run by former army general Meir Dagan. Interpol has now issued warrants for the 11 members of the alleged hit squad who used false EU passports, including British ones, to travel to Dubai in order to kill al-Mabhouh. David Miliband, the Foreign Secretary, has described the use of fake British passports in the assassination as an "outrage" and has said he remains determined to "get to the bottom of" the affair. The identities of six Britons living in Israel were stolen by members of an alleged hit squad which killed Mahmoud al-Mabhouh in Dubai in January. Mr Miliband spoke out after the Israeli ambassador to London, Ron Prosor, was called to the Foreign Office to discuss the affair, which is rapidly escalating into a major diplomatic crisis. "We wanted to give Israel every opportunity to share with us what it knows about this incident," Mr Miliband said. "We hope and expect that they will co-operate fully with the investigation that has been launched by the Prime Minister and will be undertaken by the Serious Organised Crime Agency." Miliband denied that the UK Government was merely "going through the motions" of asking questions about the incident. "There's obviously been a very serious incident involving British passports... we think it is right to have the investigation the Prime Minister has launched," he said. "That is not going through the motions, that is the rightful business of government." He added: "We want to get to the bottom of the issues of the fraudulent use passports and their potential use. That is the most important thing to do." Mr Prosor, who spent less than an hour discussing the matter with Sir Peter Ricketts, the head of the diplomatic service, said: "I was unable to add additional information to Sir Peter Ricketts's request." Meanwhile the Israeli ambassador to Ireland insisted he knew nothing about how three faked Irish passports also came to be used by the alleged killers.