By Huseyin Hayatsever, Tuvan Gumrukcu and Jonathan Spicer ANKARA/ISTANBUL (Reuters) -Turkish President Tayyip Erdogan said on Monday that protests over the jailing of Istanbul's mayor had become a "movement of violence" and that the main opposition party would be held accountable for injured police officers and damage to property.

The head of Turkey’s main opposition party has visited jailed Istanbul Mayor Ekrem Imamoglu after six nights of massive protests calling for his release.