The British government has called in the Israeli ambassador to discuss the use of fake UK passports by the alleged killers of a Hamas commander in Dubai.
Prime Minister Gordon Brown has also ordered an inquiry into the passports, which bear the names of six British-Israelis who are not the men pictured.
Dubai police believe 11 "agents with European passports" killed Palestinian militant Mahmoud al-Mabhouh in January, the BBC reports.
Israel said there was no evidence to link its secret service.
It is expected that Israeli Ambassador Ron Prosor will meet Sir Peter Ricketts, head of the diplomatic service, on Thursday.
Israel's ambassador to the Republic of Ireland, Zion Evroni, said he had received a summons from the country's Department of Foreign Affairs and would be meeting Minister Michael Martin.