Britain has announced the expulsion of an Israeli diplomat, following the use of forged British passports by the killers of a Palestinian Hamas commander in Dubai, in January.
The Foreign Secretary, David Miliband, said British investigators had concluded that the sophisticated forgeries were the work of a state security agency.
Mr Miliband told parliament there were compelling reasons to believe that Israel was responsible for the misuse of the passports, the originals of which belonged to people with dual British and Israeli citizenship.
The Israeli ambassador said his country was disappointed by the decision.
The BBC's diplomatic correspondent is Jonathan Marcus.
What point does he believe Mr Miliband was making by taking this action?
First broadcast 23 March 2010