It’s usually not a good sign when a country starts arresting embassy folks.
Ayatollah Jannati did not say how many employees would be tried or on what charges.
“In these incidents, their embassy had a presence, some people were arrested,” he told the thousands of worshippers at Friday prayers, according to news agencies.
Ayatollah Jannati said on Friday: “After the election, the enemy could not stand people’s joy. The enemy made an effort to poison the people. They had planned a velvet revolution before the election.”
He said the UK Foreign Office had warned of possible “street riots” around the 12 June election and had advised its nationals to avoid public places.
BBC diplomatic correspondent Jonathan Marcus says Ayatollah Jannati’s speech marks a significant deterioration in the already bad relationship between London and Tehran.