Ethiopia’s prime minister stepped up a military offensive in the northern region of Tigray on Sunday with air strikes as part of what he called a “law enforcement operation”, increasing fears of outright civil war in Africa’s second-most populous country. Reuters reports that, also on Sunday, the Prime Minister, who has defied calls from the United Nations and allies in the region to negotiate with leaders in Tigray, home of the ethnic group that dominated the federal government before he took power in 2018, named a new chief of the army, a new intelligence chief, and a new federal police commissioner and foreign minister, changes that analysts said brought close allies into top posts as the conflict escalates. One of the biggest risks is that Ethiopia’s army will split along ethnic lines, with Tigrayans defecting to the regional force, something analysts say signs show is already happening.