Critics say the arrest of Istanbul's mayor is part of a mounting crackdown by Turkey's president to silence all dissent.

Turkish authorities detained Istanbul Mayor Ekrem Imamoglu – a key rival to President Recep Tayyip Erdogan – on Wednesday as part of corruption and terrorism investigations. Detention orders were also issued for around 100 others connected to the mayor,

The moves against Istanbul Mayor Ekrem Imamoglu and dozens of others could help extend President Recep Tayyip Erdogan’s two decades in power.