Italian police have arrested around 40 suspects in raids to break up a gang smuggling migrants from Iraq, Pakistan and Afghanistan in life-threatening conditions, officers announced Wednesday. Officers in the the southern city of Lecce, and in Bologna and Ravenna in the north acted together to break up the operation, arresting nationals from Afghanistan, India and Pakistan. \"The operation uncovered a sizeable smuggling ring. Over the course of a year we intercepted a influx of over 5,000 immigrants in the Salento region\" in southern Italy, police prefect Vincenzo Carella told ANSA news agency. Police began investigating in 2010 after they found about 50 migrants from Afghanistan, including some children, hidden on a boat docked in Ravenna, Commissioner Elena Joland Ceria of Bologna police told Sky TG24. They were crammed into chemical toilets hidden inside a lorry on board the vessel. Police discovered that the traffickers brought the migrants in on small boats that were in poor condition or hidden in ferries serving ports on the Adriatic coast. Given the conditions, they were in constant danger of death, said investigators. Once in Italy, they were moved on towards Germany, Switzerland, Austria, France, Belgium and Denmark. Piero Grasso, head of the National Anti-mafia Agency, said it was the first mission the agency had carried out since expanding into human trafficking investigations. He said the operation had relied on \"a large quantity of wiretaps hidded near the traffickers.\" Investigators think the operation was run from Greece and Turkey. It had cells operating in the capital Rome; in the northern cities of Milan, Cremona, Bologna, Bergamo and Brescia; in the central cities of Teramo and Ascoli; and Bari in the south.