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Four members of a Muslim family have been killed after a truck was driven into them in London Ontario, Canada. A nine-year-old boy, in hospital with serious injuries, is the only survivor of the attack that killed his sister, father, mother and grandmother.

Canadian Prime Minister Justin Trudeau has condemned the attack as an act of terror.

Rebecca Zandbergen, host of CBC London Morning, explains what happened and the arrest that has been made.

Photo: People attend a vigil near the scene of the attack in London Ontario, Canada Credit: Reuters