Prime Minister Justin Trudeau has confirmed a Canadian is among the seven people killed in last nights attacks in London.
In the attack, police and witnesses say a white van crashed into pedestrians on London Bridge and then men with knives started attacking people at nearby bars and restaurants.
British police say they have arrested 12 people in east London over the attack.
Officers said the arrests were made Sunday morning in east London by counterterrorism officials.
A British Transport Police officer and an off-duty officer were among the 48 injured.
In addition, three attackers were shot dead by police.