British police have named the third London attacker as 22-year-old Youssef Zaghba, an Italian of Moroccan descent from east London.
The Metropolitan police said he was not a "person of interest" before Saturday's attack.
Earlier police admitted that one of the other attackers was on their radar as a member of an outlawed radical Islamist group, but said an investigation into him had been downgraded as there was no evidence he posed an imminent threat.
Khuram Shazad Butt was associated with the banned extremist group al-Muhajiroun, co-founded by notorious hate preacher Anjem Choudary, and appeared in a 2016 documentary called "The Jihadis Next Door."
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