Britain will offer authorities in France the security fences used to protect world leaders at this week’s NATO summit in south Wales after more immigrants climb over the fence in Calais, last night.

An eye-witness has told Kent Online that more than 50 immigrants tried to board a ferry bound for Dover, breaking over the fences in Calais at 11pm, local time, on Saturday.

Passenger Karen Reeves said: “Fifity or so immigrants broke over the fence. They were trying to get on the top of lorries to get on the ferry.

“As we’re on a motorcycle, we were first to get on the ferry - with one lorry - before P&O lifted the ramp for about half an hour until situation had been dealt with.”

This comes days after 100 asylum seekers charged onto the ramp of a P&O vessel, climbing over fences and overpowering security staff.

Calais’ mayor Natacha Bouchart had threatened to block all ferry traffic into the port unless she received help to improve security there.

Earlier in the week, she made a call for Britain to do more to help control the migrants, however ministers insist it’s ultimately the French who have to deal with the problem.

P&O are yet to comment.