Turkish authorities have detained Istanbul Mayor Ekrem Imamoglu, a key rival to President Recep Tayyip Erdogan, as part of corruption and terror investigations, according to state broadcaster TRT, citing the Istanbul Prosecutor’s Office.

ISTANBUL (AP) — Turkish police on Wednesday arrested Istanbul’s mayor — a key rival of President Recep Tayyip Erdogan — as part of an investigation into alleged corruption and terror links, media reports said. It was a dramatic escalation in an ongoing crackdown by the government on the opposition and dissenting voices.

Police in Turkey arrested Istanbul's mayor on charges related to corruption and terrorism, and arrest warrants were issued for about a hundred others. The mayor is a popular opposition leader and rival of the Turkish president.