slavery is happening now in every major urban centre in the uk, according to a new report by the national crime agency.more than 300 police investigations are under way, dealing with `tens of thousands of victims` of modern slavery across the country, the report says. it warns that estimates of 10,000 to 13,000 victims in the uk are the `tip of the iceberg`, and says the problem affects `every large town and city in the country`. a surge in operations focusing on labour and sexual exploitation over the past three months has uncovered a wide range of cases, says the guardian, `ranging from a romanian organised crime gang making €5m (£4.5m) from advertising prostitutes online and laundering the proceeds, to a 12-year-old girl being trafficked into the uk to take children to school`.there were 111 modern slavery arrests in the uk in may and june - and another 40 in europe.most victims come from eastern europe, vietnam and nigeria. about half are women and half men.`the more that we look for modern slavery, the more we find evidence of the widespread abuse of the vulnerable,` said the national crime agency's will kerr. `the growing body of evidence we are collecting points to the scale being far larger than anyone previously thought.`among better-publicised modern slavery victims are people forcibly kept prisoner to work in brothels as sex workers. but kerr als...