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Hundreds of ultras have pledged to "unleash hell" as they post photos of their training camps on the Russian social media site Vkontakte (VK).

On VK group "Russian Hooligans" a group moderator posted: "We are starting operation 'Mundial'. Our plan is already well underway."

Another warned English fans: "They'd better go to the gym and prepare themselves somehow."

One plan involves luring Three Lions fans to Reutov, a small town near Moscow, where they would be easier targets to pick out.

A Russian ultra bragged: "OK. You want a war, then you will have it. Fighting is in our blood — this June we will do more than just sing."

Russian hooligans like to attack rival firms in so-called "Wall to wall" street battles, where two opposing sides slam into each other in all-out bare-fisted brawls.

It comes after the news that Russian and Argentinian hooligans plan to join forces to take on England fans.

Authorities have warned England fans that there is a high risk of clashes with Russian gangs if they travel to the World Cup.

(Image: VKONTAKTE)

Deputy chief constable Mark Roberts of the National Police Chiefs' Council warned in February of violence.

"The behaviour of Russian fans needs to be a factor in deciding whether to go there or not," he said.

Recently a Spanish cop died after a clash with Russian ultras at the Athletic Bilbao and Spartak Moscow Europa League clash.

Authorities will be worried about a repeat of the violence at Euro 2016 when at least 150 of Russia's best-trained ultras caused mayhem in France.

(Image: VKONTAKTE) (Image: VKONTAKTE)

England fan Andrew Bache, 51, was left with brain injuries and a coma — from which he only woke up last month.

The Foreign and Commonwealth Office (FCO) has advised all England fans travelling to Russia to prepare for hostility as a result of the increased tensions over poisoned Russian spy Sergei Skripal.

The FCO said: "Due to heightened political tensions between the UK and Russia, you should be aware of the possibility of anti-British sentiment or harassment at this time.

"If you're currently in Russia or due to travel in the coming weeks, you're advised to remain vigilant, avoid any protests or demonstrations and avoid commenting publicly on political developments."

Here are some of the items banned by Russian hooligan firms ahead of the 2018 World Cup.