Iran's Ministry of Foreign Affairs summoned a British envoy in Tehran over the arrest of Iranian nationals in the United Kingdom on charges of espionage, Reuters reported citing the state media.

"Following the unjustified arrest of a number of Iranian nationals in the UK... the British charge d'affaires in Tehran was summoned on Sunday," Iran's IRNA news agency said.

British police held 7 Iranians earlier this month in two separate operations.

Of those, three men appeared in a London court on Saturday after being charged with engaging in conduct likely to assist a foreign intelligence service, that being Iran in their case.

According to the British Home Office, the men were irregular migrants who arrived in the UK between 2016 and 2022.

UK Police say that the alleged spying occurred from August 2024 to February 2025.

Meanwhile, the other four men — who were arrested on suspicion of preparation of a terrorist act — have been released from custody but they still face a probe.