City police chief describes carnage at street festival as ‘the darkest day’ and confirms arrest of 30-year-old man

• Vancouver street festival deaths – latest updates

At least 11 people are dead and dozens injured after a driver ploughed into a crowd at a street festival in Vancouver on the eve of Canada’s election, in an attack that the prime minister, Mark Carney, said left the country “shocked, devastated and heartbroken”.

Vancouver’s police chief described the carnage as “the darkest day” in the city’s history and told reporters it was “impossible to overstate how many lives have been impacted for ever” by the lone driver.