Istanbul (DPA) - Speaking in Istanbul before travelling to Libya for an Africa- European Union summit Erdogan said the credibility of the Wikileaks website that leaked the documents was "questionable", Turkey's news agency reported."That's why we are waiting to see what comes from Wikileaks. Then we can evaluate it and give an opinion," he said.Three international news outlets - the New York Times, Britain's Guardian daily and Germany's Der Spiegel news magazine - began leaking the messages at the same time as Wikileaks.They show US diplomats as being sceptical about Erdogan's ruling Justice and Development (AKP) party, believing it to be pushing an Islamist agenda.