Mourners attend a vigil in memory of victims of a van attack in north Toronto, Ontario, Canada, April 29, 2018. REUTERS/Carlo AllegriMourners attend a vigil in memory of victims of a van attack on Yonge Street in Toronto, Ontario, Canada, April 29, 2018. REUTERS/Carlo AllegriMourners attend a vigil in memory of victims of a van attack on Yonge Street in Toronto, Ontario, Canada, April 29, 2018. REUTERS/Carlo AllegriCanada’s Prime Minister Justin Trudeau, Governor General Julie Payette and Toronto Mayor John Tory attend a vigil at Mel Lastman Square for van attack victims in Toronto, Ontario, Canada April 29, 2018. REUTERS/Fred ThornhillA sea of flowers decorates Mel Lastman Square where a vigil for van attack victims is held in Toronto, Ontario, Canada April 29, 2018. REUTERS/Fred ThornhillA makeshift memorial is pictured during a vigil in memory of victims of a van attack on Yonge Street in Toronto, Ontario, Canada, April 29, 2018. REUTERS/Carlo Allegri