Third London Bridge attacker is named as Moroccan-born Youssef Zaghba amid claims Italian authorities tipped off Britain

The third terrorist behind the London Bridge attacks has been named as a 22-year-old Italian-Moroccan amid claims British authorities had been tipped off about the risk he posed, the Daily Mail reported.

Youssef Zaghba was born in Fez, Morocco to a Moroccan father and Italian mother, Italian newspaper Corriere Della Sera reports.

The paper states Zaghba was stopped at Bologna airport in 2016 apparently trying to travel to Syria and that Italian authorities had tipped off Britain about his movements.

An Italian intelligence source told the paper that Zaghba had since been acquitted of trying to go to Syria but was on a "persons at risk" list.

It is said he was caught at the airport with a one-way ticket to Istanbul, carrying just a backpack, a passport and a mobile phone.

The Met Police have insisted he was not a "subject of interest", but the claims in Italy will raise questions over how Zaghba managed to enter Britain before carrying out the attack.

The third terrorist has been named as Youssef Zaghba. Photo / Supplied

Reports in Italy suggest he work got "seasonal job" in a London restaurant and continued to speak to his mother in Italy.

Scotland Yard said described Zaghba as "of east London", suggesting he has been in the capital for some time.

The two other attackers - Khuram Shazad Butt, 27, and Rachid Redouane, 30 - were named yesterday.

A Scotland Yard spokesman said: "While formal identification is yet to take place, detectives believe he is 22-year-old Youssef Zaghba, from east London. The deceased's family have been informed.

The attackers were seen walking through Borough Market. Photo / Supplied

"He is believed to be an Italian national of Moroccan dissent. He was not a police or MI5 subject of interest."

It comes after details of the Manchester bombing were leaking in the US before they were released by police in the UK.