|Turkey: Now also a fake referendum.result for Recep Tayip Erdogan|
As many as 2.5 million votes could have been manipulated in Sunday's poll which saw a narrow "yes" vote to grant expanded presidential powers, according to observers.
But the EU's call for a probe was blasted as "unacceptable" by Turkish government minister Omer Celik, who urged the bloc to "respect democratic processes". Note EU-Digest: "Omer Celik please stand corrected - this Referendum and the Erdogan government did not respect "democratic processes" as was clearly demonstrated".
The Council of Europe, which monitored the referendum, claimed it was an uneven contest as the "yes" side had dominated campaign coverage, with the arrest of journalists and the closure of media outlets silencing other views.
Mr Korun said: "There is a suspicion that up to 2.5 million votes could have been manipulated.
He also said a last-minute decision by the Turkish election authority (YSK) to allow ballot envelopes without the official stamp was illegal.
Read more: Turkey referendum: Ankara blasts EU call to investigate vote