Migrant children in northern France are forced into crime and prostitution on a daily basis to secure a place to stay in migrant camps or the promise of passage to Britain, the UN children’s agency said.

More than 70% of camps in Haiti, home to an estimated 1.3 million earthquake victims, lack proper international management nearly nine months after the disaster, leaving them at increased risk of sexual and gang violence, hunger and forced eviction, campaigners said.