Images of Gibraltar, in the middle of a diplomatic row Tensions over the territory of Gibraltar on Spain's southern tip rose last month after the country dropped 70 concrete blocks into the contested waters off its coast with the aim of creating an artificial reef. Madrid accuses Gibraltar of creating the reef to prevent Spanish fishermen from casting their nets in the waters around the British territory and has responded by beefing up border controls with Gibraltar, causing tailbacks of cars lasting several hours. Stock shots of Gibraltar.