The United Kingdom’s Foreign Office has summoned Iran’s ambassador to London, Seyed Ali Mousavi, following allegations that Tehran was involved in reckless and destabilizing activities internationally. The move came after reports that an Iranian national and a British-Iranian dual citizen were accused of conducting hostile surveillance on London’s Jewish community.

According to the British Foreign Office, the ambassador was called in after the two suspects, identified as 40-year-old Nematollah Shahsavani and 22-year-old Alireza Farasati, were detained earlier this month as part of an Iran-related investigation. They allegedly carried out reconnaissance operations at key sites, including Britain’s oldest synagogue.

In an official statement, the UK government said it takes threats from Iran and its affiliated groups very seriously and will not tolerate such activities. Authorities added that all necessary measures will be taken to ensure national security and protect citizens.