French anti-terror police are to throw a ring of steel around England's opening game against Russia amid fears of ISIS-style attack.
Tougher security measures will be implemented and a large exclusion zone will be created around the Stade Velodrome. Only ticketed fans will be allowed through. Armed undercover anti-terror officers will also mingle with supporters outside local bars and restaurants.
A source said: "The tournament as a whole will have the tighest security of any sporting event ever.
"The fact that England and Russia are playing each other in Marseille is an added complication."