Thousands of people have gathered outside Istanbul’s city hall for a second consecutive night to rally against the arrest of the city’s popular mayor.

Turkey's authoritarian crackdown on political opposition continued Thursday with 37 people arrested for social media posts deemed "provocative." The posts came after the arrest of opposition leader Mayor Ekrem Imamoglu.

Authorities in Turkey have arrested dozens of people for "provocative" social media posts, after detaining the mayor of Istanbul Ekrem Imamoglu on Wednesday. Imamoglu was one of more than 100 people held on charges including corruption and aiding terrorist groups - a move that has sparked protests in Istanbul and the capital Ankara.