Turkish President Recep Tayyip Erdogan has blamed the followers of US-based cleric Fethullah Gulen for a series of bomb attacks in southeastern Turkey.

At least three attacks on Wednesday and Thursday left 10 dead, mostly police and soldiers, and wounded at least 300. In a televised speech, Erdogan said Turkey was facing joint attacks by various "terrorist organizations" who act together, and linked Gulen's followers to the attacks.

Ankara also blames Gulen for the coup attempt on July 15 and demanded the US to extradite the self-exiled cleric, who denied any involvement.