• In the Dutch city of Rotterdam, a warning from the Spanish police over a security threat led to the cancellation of a concert by the Californian band Allah-Las.

There was some confusion over the detention of the driver of a Spanish van, above, which was loaded with gas canisters, near the concert venue.

The police cautioned drawing links to the attacks in Spain last week, when a terrorist cell killed 15 people. Gas canisters had played a central part in what appears to have been its original, wider plot, which was thwarted by an accidental explosion.

Our correspondents there explored the life of Abdelbaki Essati, the shadowy imam who the Spanish authorities say they believe was at the center of that cell.

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