* Crushing 5-Star victory in Rome, elects first woman mayor
* Anti-establishment party enjoys shock win in Turin
* Renzi's PD party keeps hold of Milan and Bologna

Italian Prime Minister Matteo Renzi was trounced by the anti-establishment 5-Star Movement in local elections in Rome and Turin on Sunday, clouding his chances of winning a do-or-die referendum in October.
The result represented a major breakthrough for 5-Star, which feeds off popular anger over widespread corruption, with the party's Virginia Raggi, a 37-year-old lawyer, making history by becoming the first woman mayor in the Italian capital.
"A new era is beginning with us," said Raggi, who won 67% of the vote in the run-off ballot. "We'll work to bring back legality and transparency to the city's institutions."
As a consolation for Renzi, his centre-left Democratic Party (PD) held on to power in Italy's financial capital Milan and in the northern city of Bologna, beating more traditional, centre-right candidates in both places.
Renzi has said he would not step down whatever the results on Sunday. Instead, he has pinned his future on the referendum on his constitutional reform that, he says, will bring stability to Italy and end its tradition of revolving-door governments.
But the losses in Rome and Turin suggest he might struggle to rally the nation behind him, with opposition parties lined up to reject his reform and even his own PD divided over the issue.
The prime minister took office in 2014 promising to revitalise Italy, but he has struggled to boost economic growth and create jobs after years of stagnation. He has also been hurt by repeated scandals in the banking sector.
Party bigwigs stayed off TV screens on Sunday night as they tried to digest the results, but the PD said in statement the vote had "national indications" that would be discussed at a special meeting of party leaders on Friday.
"The run-off results in Rome and Turin were a clear and unqualified defeat for PD candidates," the statement said.
The PD's defeat in Rome had been expected after widespread criticism of its management of the city over the past three years, with its mayor forced to resign in 2015 in a scandal over his expenses.
But the loss in Turin, a centre-left stronghold and home of carmaker Fiat, was a major shock. The incumbent, Piero Fassino, a veteran party heavyweight, was swept aside by 5-Star candidate Chiara Appendino, 31, who overturned an 11-point gap after the first round to win 55% of the vote.
"It will be difficult (for the PD) to downplay what happened," wrote Massimo Franco, leading political commentator for the Corriere della Sera newspaper.
The vote clearly would exacerbate party divisions and weaken Renzi's dominant position, Franco said.
Broader appeal
Five-Star was founded seven years ago by comedian Beppe Grillo and has so far controlled just a handful of medium-sized towns. Success in Rome and Turin could prove a springboard to victory in national elections due in 2018.
The fiery Grillo, 67, has retreated from front-line politics over the last 18 months, making way for a generation of young leaders who have given 5-Star a more moderate image and broader appeal.
Five-Star's protests against rampant corruption in Italian public life remains its chief asset. However, analysts say it has outgrown its image as purely a party of protest and its proposals are now also being taken seriously.
These include universal income support for the poor, tougher penalties on white collar crime and tax evasion, closing down or privatising many publicly owned companies and cutting taxes for small businesses.
Some 8.6mn people, around a fifth of the total electorate, were eligible to vote on Sunday in run-off ballots for mayors of 126 towns and cities where no candidate won more than 50% of the vote in a first round of voting.