The United Nations warned on Thursday of what it described as a lost generation of Muslim Rohingya children, with half a million in refugee camps in Bangladesh facing dangers including disease and floods and those still in Myanmar lacking access to proper education.

One year since 700,000 Rohingyas fled a violent crackdown by Myanmar security forces in Rakhine state, the U.N. Children's Fund (UNICEF) gave a bleak assessment of the outlook for children on either side of the border.

"We are talking about risking the loss or the potential loss of a generation of Rohingya children," UNICEF spokesman Simon Ingram told news conference in Geneva after spending six weeks in the camps in Cox's Bazar.