The French need to get a grip here. If it was an airport that was being besieged 24 hours a day, the riot police would have been out in force. After all, the French Police have not normally been know as shy and retiring have they !
I have listened to the Today Program this morning, and it was reported that people are walking down the railway tracks, trying to get into the Tunnel. If they are caught by the Police, they are then put into a bus, driven a few km back from the coast and let out again. So these people then walk back down the track and have another go. This is ludicrous !