Spanish police have put up roadblocks across the country's northeast in hopes of capturing a fugitive suspect from the 12-member Islamic extremist cell that staged two vehicle attacks.
Four people have been arrested in connection with the attacks which killed 13, but police say they are still searching for the driver of the van.
Police say they believe the group had planned to fill the vans with explosives and create a massive attack in the Catalan capital, confirming more than 100 tanks of butane gas was found at a house in Alcanar that exploded.
Catalonia police chief Josep Lluis Trapero says he can't rule out the possibility the suspect may have crossed into France.
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