Spanish police believe van driver behind Barcelona attack may be still at large

22-year-old Moroccan Younes Abouyaaqoub is said to be at the centre of the investigation into the massacre on Las Ramblas

Meanwhile, a different suspect wanted in connection with the terror attacks has been killed, according to police sources. 

17-year-old Moussa Oukabir rented the van which ploughed into pedestrians in Barcelona on Thursday afternoon.

There are now calls for barriers to be introduced in the Las Ramblas area - where it happened. 

But international security and terrorism expert Dr Martin Coward says this isn't always the answer.

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