An Istanbul court on Wednesday sentenced Istanbul Mayor Ekrem Imamoglu, the main rival of Turkey's President Tayyip Erdogan, to a fresh prison term, state broadcaster TRT reported, extending a crackdown on the opposition.

A Turkish court has convicted Istanbul’s jailed opposition mayor of insulting and threatening a public official.

Turkish opposition figure Ekrem Imamoglu, the mayor of Istanbul, is already in pre-trial detention on separate charges, but has now been hit with an additional prison sentence.