Christine Archibald, from Castlegar in British Columbia, was among the seven people killed in the attack by three knife-wielding men who mowed down pedestrians on London Bridge before going on a stabbing spree at the nearby Borough Market.
At least two people have died after being after reportedly being struck by a van on London Bridge on Saturday night. In the second incident, the terrorist stabbed multiple people at Borough market before being neutralised by the police.
They were wearing what appeared to be explosive vests that were later discovered to be fake.
Rowley said eight police officers fired "an unprecedented number" of bullets at the three men suspected of carrying out the attacks.
Another 36 men and women are now in hospital, 21 of whom are in a critical condition, according to NHS England. Of these 36, are still being treated, 21 one of whom are in a critical condition.
His friend applied a tourniquet, she said, explaining she'd like to find the two police officers who helped stem his bleeding and transported him to the hospital. He was stabbed in the face and leg.
Police Scotland also issued a warning about hate crime to those considering targeting any communities over concerns.
Meanwhile, Canadian national Chrissy Archibald has been named by Canadian broadcaster CTV as the first victim of the attack.
One Frenchman is also reported to be among the dead.
A huge cordon remains around the scene as the investigation continues.
Police have foiled 18 terror plots since 2013 and arrest around one person every day in counter-terror raids, Ms Dick said.
Police said that one man had been released without charge, but four men and seven women were still being detained under terrorism legislation.
He said attackers who have "have come to kill us", should be dealt with as rapidly as possible, including by lawful "shoot to kill".
Forty-eight people, including two police officers, were treated at hospitals.
May, under fire because of three major attacks in Britain in the last three months, said Corbyn wasn't fit to safeguard Britain's security at a time of heightened threat.
"A detachment of Islamic State fighters executed yesterday's London attack", a statement posted on Amaq's media page, monitored in Cairo, said.
British Prime Minister Theresa May has paid a private visit to some of the victims of the vehicle and knife attacks.
Former Australian Secret Intelligence Service (ASIS) officer Warren Reed said Islamic State was losing the battle in the Middle East and warned the group was desperately appealing to radicalised Muslims to carry out attacks on home soil.
Dick said Monday the attack was "ghastly", but that Londoners are pulling together and refusing to be cowed by extremists.
Where did it take place? "It is time to say enough is enough", she added.
Most of the London Underground stations reopened in the neighborhood where the attack took place, allowing normal life and commerce to resume after more than 24 hours of lockdown.