Spanish police have confirmed that the arrests of two alleged members of an Al-Qaeda terrorist cell was as a result of "international police co-operation".
It's understood that the force received support from their French and Moroccan counterparts.
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One person has been confirmed dead and several are injured in the ongoing incident in Las Ramblas.
A number of fatalities and several injuries have been reported after a van has crashed into people in the Ramblas area of Barcelona.
John Underhill said geological changes 55 million years ago mean the UK's geology is unsuitable for shale oil and gas production.