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There are no further details about the identity of the WHO worker or the reasons for his detention.

Although the WHO has warned many times of the health risks of extreme heat, this is its first report since 1969 specifically on heat stress at work.

The WHO said the crisis was "entirely preventable" and condemned what it called the "deliberate blocking and delay of large-scale food, health, and humanitarian aid".

On Monday night, the WHO put out a statement saying it condemned "in the strongest terms" attacks on its facilities.

The number of young primary school children in the UK who have had both recommended doses of the MMR vaccine is below WHO targets.