A quarter of all thyroid cancer cases among patients who were children at the time of the Chernobyl accident 32 years ago, are “probably” due to high doses of radiation received during and after the event, the United Nations body reviewing the effects of atomic radiation on human health and the environment has said.

A technical team sent by the Organisation for the Prohibition of Chemical Weapons (OPCW) to the site of an alleged chemical weapons attack in the United Kingdom has identified toxic agents consistent with the UK’s initial investigation, the top United Nations disarmament official told the Security Council on Wednesday.

While the number of migrants and refugees reaching Europe declined last year, the dangers they faced along the journey in many cases increased, according to a new report from the United Nations refugee agency.

Results of tests of samples collected from individuals exposed to a nerve agent in Salisbury, the United Kingdom, are expected to be received by early next week, the head of the United Nations-backed body working to rid the world of chemical weapons said on Wednesday.