By Tuvan Gumrukcu, Mert Ozkan, Mehmet Emin Caliskan and Ece Toksabay ISTANBUL (Reuters) - Protests against the detention of Istanbul's mayor grew on Friday and turned increasingly tense, Turkey's biggest show of civil disobedience in more than a decade after President Tayyip Erdogan warned it would not be tolerated.

Turkey's opposition party has urged supporters to take to the streets for peaceful demonstrations against the arrest of Istanbul’s mayor and top rival to President Recep Tayyip Erdogan

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.