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Emergency servies work at the scene where a truck crashed into the Ahlens department store at Drottninggatan in central Stockholm, April 7, 2017.
 / AFP PHOTO / Jonathan NACKSTRAND        (Photo credit should read JONATHAN NACKSTRAND/AFP/Getty Images)
Emergency servies work at the scene where a truck crashed into the Ahlens department store at Drottninggatan in central Stockholm, April 7, 2017.
 / AFP PHOTO / Jonathan NACKSTRAND        (Photo credit should read JONATHAN NACKSTRAND/AFP/Getty Images)

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    When vehicles become weapons

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When vehicles become weapons

Stockholm, Sweden, has become the latest city to see a vehicle used in a terror attack. CNN's Nic Robertson looks at the history of the use of vehicles in terror attacks.

When vehicles become weapons

Stockholm, Sweden, has become the latest city to see a vehicle used in a terror attack. CNN's Nic Robertson looks at the history of the use of vehicles in terror attacks.