Isis supporters have apparently been celebrating the terror attacks in Brussels by asking their followers to suggest which country they should target next - and the UK came out on top.

On an online forum purporting to be run by members of the extremist group, a user set up a poll asking: “What will the colour of the Eiffel Tower be in the next attacks?”

And disturbingly, the UK came out top in the survey, with half of the terror groups’ online supporters backing it as their number one choice for an attack.

The question was asked after the Eiffel Tower was lit up in the colours of the Belgian flag in solidarity with Brussels, which was hit earlier this week by a terror attack which killed at least 31 people.

Zaventem airport and Maalbeek Metro Station in the city were targeted by three explosions by suicide bombers on Tuesday morning.

Details about Brussels attackers revealed

The US and Russia were also voted as prime targets for an assault, Mail Online reports.

One user tweeted: “The Islamic State will attack London, Washington, Rome and all the infidels' capitals”.

Another said: “The Crusaders are blundered and confused. Yesterday Paris, today Brussels, and they don't know where will be the next attack."

In pictures: Terror attacks at Brussels metro station Show all 30 1 /30 In pictures: Terror attacks at Brussels metro station In pictures: Terror attacks at Brussels metro station A private security guard helps a wounded women outside the Maalbeek metro station in Brussels In pictures: Terror attacks at Brussels metro station In pictures: Terror attacks at Brussels metro station Wounded people receive assistance by rescuers outside the Maalbeek metro station in Brussels In pictures: Terror attacks at Brussels metro station Rescue workers treat victims outside the Maelbeek underground station In pictures: Terror attacks at Brussels metro station Passengers waiting to be evacuated from the train between Arts-Lois and Maelbeek In pictures: Terror attacks at Brussels metro station In pictures: Terror attacks at Brussels metro station In pictures: Terror attacks at Brussels metro station In pictures: Terror attacks at Brussels metro station Emergency services and police work around a metro station after an explosion in Brussels In pictures: Terror attacks at Brussels metro station In pictures: Terror attacks at Brussels metro station Rescue teams evacuate wounded people outside the Maalbeek metro station in Brussels In pictures: Terror attacks at Brussels metro station A woman is evacuated in an ambulance by emergency services after a explosion in a main metro station in Brussels In pictures: Terror attacks at Brussels metro station A Belgian soldier stands guard outside the Maalbeek metro station in Brussels after a blast at this station located near the EU institutions In pictures: Terror attacks at Brussels metro station Belgian police officers stand outside the Maalbeek metro station in Brussels In pictures: Terror attacks at Brussels metro station Belgian policemen and a soldier carrying an injured person after an explosion at the Maelbeek Metro station in Brussels In pictures: Terror attacks at Brussels metro station A view of the train after the explosion in Maelbeek station in Brussels In pictures: Terror attacks at Brussels metro station People receive treatment as emergency services attend the scene after an explosion in a main metro station in Brussels In pictures: Terror attacks at Brussels metro station Maelbeek Metro station after an explosion on a train in Brussels In pictures: Terror attacks at Brussels metro station Passengers walk on underground metro tracks to be evacuated after an explosion at Maelbeek train station in Brussels In pictures: Terror attacks at Brussels metro station A victim receives first aid by rescuers, near Maalbeek metro station in Brussels In pictures: Terror attacks at Brussels metro station Firefighters arrive at the scene near Maalbeek metro station In pictures: Terror attacks at Brussels metro station Emergency workers arrive at a security perimeter set near Maalbeek metro station in Brussels In pictures: Terror attacks at Brussels metro station Emergency rescue workers stretcher an unidentified person at the site of an explosion at a metro station in Brussels AP In pictures: Terror attacks at Brussels metro station Police seal off the area at the scene of a blast outside a metro station in Brussels Reuters In pictures: Terror attacks at Brussels metro station Emergency personnel are seen at the scene of a blast outside a metro station in Brussels In pictures: Terror attacks at Brussels metro station Emergency personnel are seen at the scene of a blast outside a metro station in Brussels Reuters In pictures: Terror attacks at Brussels metro station Belgian police and emergency staff arriving in the Wetstraat - Rue de la Loi, which has been evacuated after an explosion at the Maelbeek metro station in Brussels In pictures: Terror attacks at Brussels metro station Smoke rising from the Maalbeek underground, in Brussels, following a blast at the station close to the capital's European quarter Getty Images In pictures: Terror attacks at Brussels metro station People are evacuated from the Schuman station in Brussels In pictures: Terror attacks at Brussels metro station The scene outside the Maalbeek underground in Brussels after the explosion

Isis claimed responsibility for the attacks on the capital city which they said were revenge for Belgium’s participation in co-ordinated air strikes against their positions in Syria and Iraq.

A spokesman for the Islamic extremist group said: “Fighters opened fire inside Zaventem Airport, before several of them detonated their explosive belts, as a martyrdom bomber detonated his explosive belt in the Maalbeek Metro station."