Gallery: Aftermath of the London attack
LONDON, ENGLAND - JUNE 04: A floral tribute from 'Newcastle Central' is left near the scene of last night's terrorist attack on June 4, 2017 in London, England. Police continue to cordon off an area after responding to terrorist attacks on London Bridge and Borough Market where 7 people were killed and at least 48 injured last night. Three attackers were shot dead by armed police. (Photo by Christopher Furlong/Getty Images)Christopher Furlong
LONDON, ENGLAND - JUNE 04: A female police officer carries flowers from a member of the public to the scene of last night's terrorist attack at London Bridge on June 4, 2017 in London, England. Police continue to cordon off an area after responding to terrorist attacks on London Bridge and Borough Market. Three attackers were shot dead by armed police. (Photo by Dan Kitwood/Getty Images)Dan Kitwood
LONDON, ENGLAND - JUNE 04: A group of young women at London Bridge following last night's terroris attack on June 4, 2017 in London, England. Police continue to cordon off an area after responding to terrorist attacks on London Bridge and Borough Marke. Three attackers were shot dead by armed police. (Photo by Dan Kitwood/Getty Images)Dan Kitwood
LONDON, ENGLAND - JUNE 04: People are lead to safety on Southwark Bridge away from London Bridge after an attack on June 4, 2017 in London, England. Police have responded to reports of a van hitting pedestrians on London Bridge in central London. (Photo by Carl Court/Getty Images)Carl Court
Armed police patrol the streets during the Simplyhealth Great Manchester Run on May 28, 2017 in Manchester, England.Anthony Devlin
Members of the public leave the area at London Bridge on June 3, 2017 in London, England. Police have responded to reports of a van hitting pedestrians on London Bridge in central London.Dan Kitwood
Emergency services arrive at the scene near Borough market at London Bridge on June 3, 2017 in London, England. Police have responded to reports of a van hitting pedestrians on London Bridge in central London.Carl Court
A police officer stands guard near London Bridge following a pair of terror attacks.CNN
British Prime Minister Theresa May claimed there was "too much tolerance" of Islamist extremism int the UK as she vowed a clampdown in the wake of the third terror attack to hit the UK this year.CNN