"A person going to Turkey with a backpack aroused some suspicion, also because he told the agent who checked him that he wanted to go and be a terrorist, then he corrected himself", Amato said.
Saturday's rampage followed a suicide bombing that killed 22 adults and children at a pop concert in Manchester two weeks ago, and an attack in March when five people died after a auto was driven into pedestrians on London's Westminster Bridge.
Zaghba may have been stopped at Bologna airport a year ago with a one-way ticket to Istanbul with just a backpack, passport and mobile phone on him.
Her family said the couple, who lived together in the Netherlands, had chose to go for a walk through the city at night, and Tyler was a few steps ahead of Chrissy when the van struck. Butt was a trainee customer services assistant on the London Underground and had appeared in the Channel 4 documentary The Jihadist Next Door, in which he was shown unveiling an Isis flag in a London park.
The sister of 32-year-old James McMullan, from Hackney, east London, said he was believed to be among those who died, after his bank card was found on a body at the scene.
After that, Amato said, any time Zaghba was in Italy, he was always tracked by Italian intelligence officers.
"Any successful attack is a failure of intelligence services", said Raffaello Pantucci, counter-terrorism expert at the Royal United Services Institute in London. While Italian officials said they had passed on their concerns about him to British intelligence officials past year, London policed added that he had not been considered to be a "subject of interest" to either police or the intelligence services. "Our city remains one of the safest in the world".
Normandy news outlet La Manche Libre reported that Frederic Loinard, the mayor of nearby Colleville-Montgomery, where Pigeard has family, confirmed the death to locals on Tuesday. Seven people were killed and dozens wounded.
"I am going to be a terrorist", Youssef Zaghba allegedly told authorities in 2016, after he was stopped in an attempt to travel to Syria.
Zaghba was born on 26 January 1995 in Fez, Morocco, where he held legal residency, although intelligence sources said he had lived with his mother Valeria Collina on the outskirts of Bologna. Nor did it alert them to the Manchester Arena bomber, British-Libyan Salman Abedi.
Zaghba, 22, returned to Italy from London sporadically over a cumulative 10 days, Amato said, during which Italian authorites "never let him out of our sight". A Moroccan chef by profession, Redouane had visisted his wife Charisse O'Leary and his 18-month-old daughter three hours before unleashing terror at the London Bridge and Borough Market. Opposition Labour Party leader Jeremy Corbyn and others have criticized May for cutting police numbers by roughly 20,000 during her tenure as home secretary.
The admission that at least one of the London Bridge attackers was known to authorities has fuelled a security debate already underway in Britain as the country counts down to an unpredictable election on Thursday. Police arrested several people and are widening their investigation after a series of attacks descr.
"I'm calling on all Londoners to pull together, and send a clear message around the world that our city will never be divided by these disgusting individuals who seek to harm us and destroy our way of life", Khan said.