Swedish police officers patrol on April 8, 2017, the area where a stolen truck was driven through a crowd outside a department in Stockholm on April 7, 2017.
A massive manhunt was underway for the driver of the stolen truck that ploughed into the crowd, killing four and injuring 15, Swedish police said. / AFP PHOTO / Odd ANDERSEN        (Photo credit should read ODD ANDERSEN/AFP/Getty Images)