The special envoy added that he plans to update Kenyan President William Ruto, Ethiopian Prime Minister Abiy Ahmed, and Djibouti's President Ismail Omar Guelleh on the situation.
He urged urgent international intervention, commending the United Nations for engaging in efforts to stabilize South Sudan. "I think it is a situation that warrants intervention by the international community."
While South Sudanese authorities have linked the killings to a militia associated with Machar, no formal charges have been brought against him.
"They have not said that Machar is directly involved," he clarified, adding, "they are saying that some of his supporters might be involved, but they have not made a direct connection."
Odinga said South Sudanese officials assured him that once investigations are complete, he would be allowed to return to Juba to meet with Machar.
"They say that when I go back to Juba, they will allow me. But I have said I will only return if they allow me to meet with Machar," he added.
Tensions in South Sudan remain high, with global agencies such as the United Nations warning that the political crisis risks plunging Juba into a civil war.