According to The Independent, Italian authorities had informed their British counterparts in April 2016 about Zaghba's efforts to join Islamic State.
The officials spoke on condition of anonymity because they were not allowed to discuss details of the case.
Italian authorities said Zaghba was stopped at the Bologna airport in March 2016 and questioned, but never charged with a crime.
He wasn't charged due to "insufficient evidence". Zaghba's Italian citizenship prevented such an expulsion, Italian daily Repubblica reported.
Italy's Internal Intelligence Service passed on information about Zaghba to MI6, which relayed the information to MI5, but the communication was in the form of a notification rather than an emergency alert and Zaghba was able to move from Italy to the United Kingdom without any hassle.
The three, who were not connected to the weekend attack on London Bridge, are being questioned at a south London police station.
The third man, 29, was also arrested on suspicion of the preparation of terrorist acts and all three have been taken for questioning while detectives search the residential address and a business premises.
London police said all 12 people held since the attack late Saturday from the Barking neighborhood in the east of the city, have been freed. All three attacks have been claimed by the Islamic State group.
May's comments came ahead of Thursday's general election, with the campaign dominated by security issues.
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The Tribune-Review's version of plus-minus for the postseason also addresses two-play, albeit with more taken into account. The 38-year-old has led Erie to four consecutive 50-win seasons. "It's a good game but it's still not done", Malkin said.
Transport for London confirmed he worked for London Underground in customer services before leaving last October.The Metropolitan Police said Butt had been subject to an investigation in 2015, but there had been no suggestion this attack was being planned. "The tempo is there in a way we haven't seen before", May had said.
Collina said, "We always kept track of his friends and made sure he didn't fall in with the wrong people".
Neighbors described Butt as an avid weightlifter.
"The British police and the MI5 began investigating Butt intensively as part of a major drive to dismantle and destabilise al-Muhajiroun, a grouping of extremists in the U.K. supportive of the ISIS", U.K. counter-terrorism officials told CNN.
Just seconds later a police jeep comes into the shot, with heavily armed officers jumping from the vechicle.
Zaghba's mother, who is a convert to Islam, told police she was anxious about her son when she went to pick him up after he was stopped at the airport, an investigative source said. 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 white van then continued to drive to Borough Market.
"When he was working in a Pakistani fast food restaurant as a cook and as a waiter, he was working up to 10 hours a day".
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