European Union nations have summoned Iranian ambassadors to protest the detention of British Embassy staff in Tehran.
Officials say EU members agreed to the move Friday at a meeting in Brussels.
EU officials are considering additional measures including visa bans on Iranian officials.
Atop Iranian cleric Friday said that some British Embassy staff will beput on trial for allegedly playing a role in post-electiondemonstrations. Ayatollah Ahmad Jannati said during a prayer sermonthat some embassy employees confessed to instigating unrest. Jannatiis close to Iran's supreme leader.
Nine British Embassy stafferswere arrested in Tehran last Sunday. Some were freed, but the Britishgovernment says two are still in custody.
Britain's foreign office expressed concern Friday and said it is investigating reports that the employees face trial.