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Less than a week after Younes Abouyaaqoub drove a van along the crowded boulevard of Las Ramblas in Barcelona, killing 13 people and injuring more than 130, all 12 suspects are now either dead or in custody. So how did the security services find them? And what matters most in a manhunt?
We spoke to Julia Rushchenko, research fellow at the Henry Jackson Centre for Radicalisation and Terrorism, and lecturer in Policing and Criminal Investigations at the University of West London, to get some answers.
Read the interview in full at VICE.