Britain says the Iranian ambassador to the UK has been summoned after an Iranian national and a British-Iranian dual national were charged last week on suspicion of helping Iran’s intelligence services, according to Reuters.

The two men appeared in a London court last week, accused of being involved in gathering information and undertaking reconnaissance of Jewish targets in Britain given to them by Iranian spy services over five weeks last summer.

“National security remains our top priority, and we take threats posed by Iran and those who do its bidding extremely seriously,” Britain’s Foreign Office said in a statement.

“This government will take all measures necessary to protect the British people, including exposing Iran’s reckless and destabilising actions at home and abroad.” The men, Nematollah Shahsavani, 40, a dual Iranian-British national, and Alireza Farasati, an Iranian national, 22, were asked to carry out hostile surveillance on the Israeli Embassy, Britain’s oldest synagogue and other Jewish targets, prosecutors said.