Euro 2012: Police prepare for England with guns, dogs and water cannons

"If things start kicking off, don't be tempted to stick around and watch the fun," the English-language newspaper warns. "The Polish police are going to come down on troublemakers like a bag full of anvils and you don't want to be there when it happens. Krakow has a long history of hooligan violence. The local police have seen it all before and they will ruin your day if you try it on."