Gibraltar: UK considers 'unprecedented' legal action
12 August 2013 Last updated at 20:23 BST
The British government is considering what it calls unprecedented legal action against Spain over its new controls on the border with Gibraltar.
The move follows further queues at the border over the weekend.
Spain imposed the additional controls earlier this month, following a dispute over fishing rights around the British territory.
The BBC's Diplomatic Correspondent James Robbins reports.