British police and intelligence services have faced questions over reports that Salman Abedi, the Manchester attacker, and one of the London Bridge attackers had been reported by concerned members of the community to an anti-terror hotline, raising questions about the effectiveness of the existing strategy.
Youssef Zaghba, aged 22, had been identified as the third assailant in the van and knife rampage on London Bridge and Borough Market last Saturday in which seven people were killed and 48 others were injured.
Questions are being raised about whether British police missed crucial warning signs that could have prevented the attack.
Speaking to those gathered, Mayor Sadiq Khan decried the attackers, saying: "You will not win".
It is not clear how the three men all knew one another, but at least two of the gang had lived within yards of one another in the Barking area of east London.
But Italy's Corriere della Sera reported that Zaghba had been stopped at Bologna airport in 2016 when trying to fly to Syria via Turkey, and that Italian authorities had identified him as a potential "foreign fighter" and tipped off Britain about his movements.
Each counter-terrorism investigation is given a name by British authorities.
As details about Butt emerged, however, they prompted questions of whether he could have been stopped sooner.
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He said the terrorist was allowed to keep his passport and was not arrested after the report.
The mother was quizzed yesterday, when she said she was anxious because her son had not been in touch with her, sources said. Her family said she had died in her fiancé's arms after being struck by the attackers' speeding van. "It's something that has no sense, for any religion, or any ideology", she said, choking back tears and calling her son's actions a "deviation of terror".
Home Secretary Amber Rudd said it was not for her or Mr Johnson to "say how that happened or what happened". She too lived overseas for some time. "And after I thought that these images of a garden were similar to the images of paradise". Pakistan-born Butt was featured for being part of a "group of British extremists intent on spreading their message of global jihad", the documentary said.
He had appeared in a documentary, "The Jihadis Next Door", that aired on British television past year.
Butt's family said Wednesday they were "shocked and appalled" by his actions. London police have not confirmed the name. The second man, Rachid Redouane, had not aroused any suspicions.
Redouane had previously been refused asylum in the United Kingdom in 2009. He then moved to London, media reported. Zaghba's father is said to be in Morocco.
Saturday's attack - the third in three months in which suspects had been on the radar of security officials - has prompted Prime Minister Theresa May to call for tougher counterterrorism laws even if it means changing human rights protections.
Before the recent attacks, Brexit and domestic issues such as the state of the health service and the cost of care for the elderly had dominated the election campaign.
Opposition leader Jeremy Corbyn, when asked by ITV television if he backed calls for May to resign, said: "Indeed I would".
But an announcement - made before the Manchester and London Bridge attacks - that they planned to make some of the elderly pay more for their care saw that lead start to shrink, and the trend has continued.
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