A strike by ferry workers caused major traffic jams in Calais, France. Hundreds of migrants camped nearby exploited the situation by trying to break into lorries bound for Britain. This led to clashes with police, who used batons and pepper spray to hold back the migrants. Some lorry drivers were threatened by migrants wielding knives and iron bars. Officials forced closure of the ferry port and Channel Tunnel. The UK also began constructing high-security fencing at the Channel Tunnel port.