 Later that year, he was appointed by United Nations Secretary-General Ban Ki-moon to lead an independent special investigation into the violence in Juba, South Sudan, in July 2016, and the response of the UNMISS.On 22 December 2018 Cammaert started leading the UN monitoring mission to oversee the UN-brokered ceasefire and redeployment of forces in the city of Al Hudaydah in Yemen.On 17 January 2019, Cammaert's convoy was reported to have been fired upon by unknown assailants, thought Cammaert remained uninjured.