UN environment chief Erik Solheim has resigned amid a row over his travel expenses.
A recent draft internal audit, obtained by Britain’s Guardian newspaper and seen by the BBC, said he had incurred costs of $488,518 (£382,111) while travelling for 529 out of 668 days.
It said this harmed the reputation of UN Environment – a body that highlights green issues and sustainability.
There was “no oversight or accountability” to monitor this travel.
Mr Solheim, a Norwegian former environment minister, says he has paid back the money where “instances of oversight” occurred.
On Tuesday, Mr Solheim himself confirmed his resignation, Norway’s NRK broadcaster reported.
A formal UN announcement is expected shortly.