The head of the UN children's agency, Unicef executive director Henrietta Fore, plans to step down to deal with a family health issue, a UN spokesperson said on Tuesday.

Fore, a former head of the US Agency for International Development (USAID) who was appointed to run Unicef by UN secretary-general Antonio Guterres in 2018, will stay in the job until a replacement is found.

Since it was established in 1946...