A mob in Nigeria has retaliated against gunmen who killed 12 people in a bar, sparking concerns about sectarian violence in the country's capital, Jos. The Plateau state has seen recurring violence in recent years, mostly linked to land disputes. The attack on the bar was rare in the city, which has previously experienced sectarian violence.

Gunmen killed at least a dozen people in Jos, the capital of Nigeria’s restive Plateau state, sparking retaliation from a mob that killed 10 more, locals said on Monday. Plateau state, in central Nigeria’s Middle Belt region, experiences recurring violence in the countryside, mostly linked to land disputes between farmers and herders. Jos has seen bouts of sectarian violence in the past, but deadly, mass casualty attacks in the crowded city have been rare in recent years. At least 12 people were...