ISTANBUL — The mayors of three major cities in southern Turkey were arrested Saturday, state-run media reported, joining a growing list of opposition figures detained since the mayor of Istanbul was imprisoned in March.

Turkiye arrested three more opposition mayors early on Saturday as part of an investigation into alleged graft, officials from the main opposition CHP said, denouncing it as a “political operation.” The early morning arrests were the latest move targeting

Three Turkish mayors who are members of a political party that opposes Turkish President Recep Tayyip Erdogan were arrested on corruption charges Saturday morning.