LONDON (Reuters) - Police on Tuesday named the third of the jihadis who killed seven people in a knife and van attack in London, someone an Italian prosecutor said had been flagged to British authorities as a potential risk after he moved to England last year.
The attack has eclipsed other issues in the political campaign for Thursday's parliamentary election, with both the ruling Conservatives and opposition Labour Party battling to defend their records on security.
Prime Minister Theresa May, facing accusations she starved police of resources, said she could seek to overturn human rights protections that make it hard to deport or detain suspected militants when there is insufficient evidence to prosecute them.
The revelation that at least one of Saturday's attackers, Khuram Butt, was known to security services has raised concerns that they lack the resources to prevent attacks.
Butt, a 27-year-old British national born in Pakistan, had appeared in a British TV documentary broadcast last year called "The Jihadis Next Door".
Saturday night's rampage, in which the three men drove into pedestrians on London Bridge before stabbing people in the bustling Borough Market area, was Britain's third Islamist attack in as many months.
The identity of the third attacker was revealed by police on Tuesday as Youssef Zaghba, a 22-year-old who had not been a subject of interest for them or the domestic intelligence agency MI5.
But an Italian prosecutor said Zaghba, who had a Moroccan father and an Italian mother, had been stopped at Bologna airport in 2016 on suspicion of being on his way to Syria, and told police he wanted to be a terrorist.
The prosecutor said Italy had lacked the evidence to prosecute Zaghba, but had warned Britain about him.
Zaghba lived in Morocco for much of his life but had made short visits to Italy to see his mother in Bologna.
As details about the jihadists have emerged, May has faced questions about her record of overseeing cuts to police numbers when she was interior minister.
However, she received some comfort from the first major poll conducted after the attacks, which showed the Conservatives' lead over Labour widening by 1 percentage point to 7 percent.
"Labour's campaign surge appears to have crested as our final poll of the campaign is the first to see the Tory (Conservative) lead expand rather than contract," Opinium's head of political polling, Adam Drummond, said.
Earlier on Tuesday, a poll conducted by Survation for ITV before the London attack, had the Conservatives' lead over Labour narrowing to just one point from six points in the same poll a week earlier.
The prevailing view among pollsters remains that May's party, which has been in government since 2010, will win a majority.
A campaign email signed by May told Conservative supporters: "With the polls tightening and with just two days to go until polling day, we need to go all out with one final push."
Less than two weeks before the London Bridge attack, a suicide bomber killed 22 adults and children at a pop concert in Manchester and, in March, five people were killed when a car drove into pedestrians on London's Westminster Bridge.
Police had already named Butt and Rachid Redouane, a 30-year-old who claimed to be Moroccan and Libyan, as two of the London Bridge attackers.
Irish state broadcaster RTE reported on Tuesday that Redouane had been refused asylum in Britain but had been able to move legally after marrying in Ireland in 2012. Britain and Ireland have reciprocal residency rights.
Butt, Redouane and Zaghba were shot dead at the scene of the attack by officers within eight minutes of police receiving the first emergency call.
The first of the dead to be named were Canadian Christine Archibald and Britons James McMullan and Kirsty Boden. The 48 injured included people from France, Spain, Australia and New Zealand.
London police said late on Tuesday that they feared a French tourist, 45-year-old Xavier Thomas, had been thrown into the River Thames by the attackers' van and drowned. His girlfriend was seriously injured in the collision.
Boden's family said she had been a nurse and had tried to help the injured.
"As she ran towards danger, in an effort to help people on the bridge, Kirsty sadly lost her life," they said in a statement.
A minute's silence was held nationwide at 11 a.m. (1000 GMT) to honor all the victims.
Before the recent attacks, Brexit and domestic issues such as the condition of the state-run health service and the cost of care for the elderly had dominated the election campaign.
When May called the election in April, her Conservatives led in opinion polls by 20 points or more.
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. Surveys now put the Conservatives ahead by between one and 12 points.
Security has become the number one issue and both main parties issued statements on Tuesday portraying their own positions on policing and intelligence as the most robust.
As interior minister from 2010 to 2016, May oversaw a drop of 20,000 in the number of police officers in England and Wales, which Labour leader Jeremy Corbyn has said should never have happened and warranted her resignation.
But MI5 has seen its budget increase and has plans to expand to 5,000 officers from 4,000 over the next five years, the intelligence agency's chief, Andrew Parker, said last year.
Corbyn has been criticised for past sympathies with militant groups, voting against counter-terrorism legislation and expressing reservations about police responding to attacks with "shoot-to-kill" tactics. Since the attack, he has said he fully supported the actions of the police.
At campaign stops on Tuesday, May was questioned almost exclusively about issues related to terrorism.
Asked if the financing of terrorism was brought up in April when she met the leaders of Saudi Arabia, a major buyer of British arms, she said: "We talked to Saudi Arabia on a whole number of issues around the question of terrorism."
Additional reporting by Kate Holton, Elizabeth Piper and Kylie MacLellan in London, by Valentina Accardo and Antonella Cinelli in Rome, and by Padraic Halpin in Dublin; Writing by Estelle Shirbon and David Milliken; Editing by Kevin Liffey and Robin Pomeroy