Two men aged 34 and 37 were arrested at separate addresses in Newham, while a 33-year-old man was arrested in Waltham Forest. The London-based HSBC worker was hailed as a hero for using his skateboard to take on the three attackers. Eight people died in addition to the attackers, and almost 50 others were hospitalized.
In a statement about the recovery of the body Tuesday, police said they haven't formally identified the victim - though they asked for information about 45-year-old Xavier Thomas, a French national who has been missing since Saturday.
Zaghb, an Italian-Moroccan, was one of three Islamic extremists who killed eight people and wounded dozens in truck and knife attacks near London Bridge last week.
Police have previously said eight officers who rushed to scene fired about 50 rounds, killing the three attackers.
The operation took place overnight and searches are ongoing at the properties, the force said. He was not charged, but local police monitored him carefully and said they had tipped off Britain when he subsequently moved to London.
Valeria Khadija Collina last spoke with her 22-year-old son, Youssef Zaghba, by telephone just two days before he and two other men plowed a van into a crowd near London Bridge and went on stabbing rampage.
Family of suspect in Portland stabbing offers condolences
Also Wednesday, an organizer cancelled an anti-Shariah law rally that had been planned for June 10 in downtown Portland. Surveillance video then shows Christian turn his attention to a man, Taliesin Namkai-Meche, who was seated.
Since the attack, 17 people have been arrested, 12 of whom have since been released without charge.
At least two of the men were known to British intelligence and law-enforcement officials, raising questions about whether anything could have been done to prevent the assault.
Authorities have said Australian nurse Kirsty Boden was trying to help other victims when she was killed in the attacks Saturday night on London Bridge and in Borough Market.
Italian authorities said Zaghba had been stopped and questioned in Italy but had not been charged with any crime.
Britain's failure to keep tabs on Zaghba despite being warned about him by Italian authorities was understandable, Italy's top policeman said on Wednesday.
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