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Gibraltar border queues 'necessary'

15 August 2013 Last updated at 12:16 BST

Spain has tightened its border controls with Gibraltar, prompting the UK to threaten legal action.

The Spanish government has said the row would not be resolved until a new artificial reef, installed by the Gibraltarians, was removed from the waters off the British territory.

The BBC's Tom Burridge reports from the queues at the Spain/Gibraltar border.