A fisherman holds a Spanish flag during a protest in the bay of Algeciras, near the Rock of Gibraltar, on August 18, 2013. A Spanish protest fleet of 38 fishing boats sailed towards Gibraltar today to demand the British outpost remove 70 concrete blocks it has dropped in their fishing grounds. British naval and Gibraltar police patrols blocked the Spanish boats from entering disputed waters around the concrete reef, which has sparked an angry row between London and Madrid.