Ethiopian Prime Minister Abiy Ahmed learnt about the death of one of the country's top engineers, Simegnew Bekele, when he arrived in the US on his latest diplomatic mission.

His chief of staff has said the prime minister was "saddened and utterly shocked" by the news.

Mr Simegnew, who was found dead in a car in the main square of the capital, Addis Ababa, died as a result of a bullet wound, police say.