Syria refugees to top 3 million

displaced Syrian children lining up to receive vaccination against polio at one of the Syrian refugee camps in the southern port city of Sidon, Lebanon. Polio has been wiped out of many countries thanks to massive use of oral vaccine. But new research suggests trying a one-two punch where the disease is still a threat.

GENEVA— The civil war in Syria has forced 3 million people out of the country as more than a million people fled in the past year, creating a crisis that the U.N. refugee agency said requires the biggest operation in its 64-year history.

The tragic milestone means that about one of every eight Syrians has fled across the border, and 6.5 million others have been displaced within Syria since the conflict began in March 2011, the Geneva-based agency said. More than half of all those uprooted are children, it said.Syria had a prewar population of 23 million.