Barcelona attack: terror spreads to open spaces

AAqgakKA van attack Thursday that killed 13 and injured dozens more along a shopping street in Spain demonstrated the difficulty protecting people in open areas, after similar vehicular assaults during the past year in France, Germany and England.

The Islamic State claimed credit for the attack. As official buildings and transportation hubs have become more fortified, security officials have warned for years that terrorists could target anywhere large crowds gather.
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