The Foreign Office has toughened its travel advice to Sweden to warn that terrorists are ‘very likely’ to try to carry out attacks.

It said attacks could be indiscriminate, including in places visited by foreigners.

The authorities in Sweden have successfully disrupted a number of planned attacks and made a number of arrests, it added.

The Foreign Office (FCDO) had updated its travel advice for Sweden in June to warn terrorists were ‘likely’ to attempt attacks before upgrading this to ‘very likely’ on Sunday (13 August).

The toughening of its advice follows attacks on the Swedish embassies in Iraq in July and in Lebanon on 9 August and the shooting of an employee at a Swedish consulate in Turkey, which were triggered by the burnings of the Koran in Sweden by anti-Islam activists.

The FCDO added: “There is a heightened threat of terrorist attacks globally against UK interests and British nationals, from groups or individuals motivated by the conflict in Iraq and Syria. You should be vigilant at this time.”

It is warning of the possibility of terror attacks against foreigners in many other countries around the world, including popular holiday destinations such as France, Spain, Cyprus, Turkey and Croatia.