Kate McCann, the mother of missing Madeleine, has asked for permission to give evidence at the libel trial of the Portuguese detective Goncalo Amoral.
Gerry McCann has already made the same request. The judge is likely to decide on November 5th.
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"Africa is very important for the United States."
The incident happened at around 8pm local time on Thursday evening.
The Foreign Secretary said "good connections" were important, and suggested the Channel Tunnel might simply be "a first step."