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LONDON, ENGLAND - JUNE 04:  Armed police officers stand guard at the perimeter cordon, following last night's London terror attack, on June 4, 2017 in London, England. Prime Minister Theresa May has left the election campaign trail to hold a meeting of the emergency response committee, Cobra, this morning following a terror attack in central London on Saturday night. 7 people were killed and at least 48 injured in terror attacks on London Bridge and Borough Market. Three attackers were shot dead by armed police.  (Photo by Leon Neal/Getty Images)
LONDON, ENGLAND - JUNE 04:  Armed police officers stand guard at the perimeter cordon, following last night's London terror attack, on June 4, 2017 in London, England. Prime Minister Theresa May has left the election campaign trail to hold a meeting of the emergency response committee, Cobra, this morning following a terror attack in central London on Saturday night. 7 people were killed and at least 48 injured in terror attacks on London Bridge and Borough Market. Three attackers were shot dead by armed police.  (Photo by Leon Neal/Getty Images)

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Police make arrests in attack-related raid

London Metropolitan Police said they seized a huge amount of forensic material as part of their efforts to determine if the three men who rampaged through central London Saturday evening, killing seven and injuring 48, were working with others.

Police make arrests in attack-related raid

London Metropolitan Police said they seized a huge amount of forensic material as part of their efforts to determine if the three men who rampaged through central London Saturday evening, killing seven and injuring 48, were working with others.