A law enforcement source has told Reuters that two people in custody in the Boston Marathon bombing case were college classmates of Dzokhar Tsarnaev, and could face criminal charges.
The source also told the news agency that the third person in custody is a US citizen, and that authorities are investigating whether classmates through away some kind of knapsack at the request of Tsarnaev.
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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.