ANKARA (Reuters) - Dozens of Turkey's most prominent artists have taken to social media to support Istanbul's ousted mayor, responding to his call for them to speak out against a decision to annul his election victory over President Tayyip Erdogan's party.

Ekrem Imamoglu had been in office less than three weeks when Turkey's High Election Board (YSK) on Monday ordered a re-run of the election, citing irregularities, after weeks of appeals by Erdogan's Islamist-rooted AK Party.