Belgium had the highest terror threat level long before the deadly attacks on a metro station and airport in Brussels. It was one of more than 40 countries around the world where the threat from terrorism was rated “high” by the Foreign Office.

The Foreign Office website states: “There is a high threat from terrorism. Attacks could be indiscriminate, including on public transport and transport hubs and in other places visited by foreigners. Brussels hosts a number of international institutions (EU and NATO) and government and foreign embassy buildings which are sensitive locations.”

The British Foreign Office has four terror threat levels. The Telegraph drew a map based on the travel instructions released by Foreign Office, where those countries in dark red have a “high” threat from terror, those in red a “general” threat, those in orange an “underlying” threat and those in yellow a “low” threat.

Greece has the second highest terror threat level (level 3), according to Foreign Office estimates.

Click here to see the full map.