Police boats have arrived at an island in Malaysia to search for a British man who went missing there.
Etienne Do, a friend of missing Gareth Huntley, posted on Twitter:
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The incident is not believed to be terror-related, British Transport Police said.
The royal couple have been in the US to mark the 300th anniversary of the foundings of New Orleans and San Antonio.
A small number of people were treated at Southgate Tube station, British Transport Police said.