REUTERS

"It looks at least as if something has been prepared. The lists are available, which indicates it was prepared and to be used at a certain stage," Hahn said, as reported by Reuters.

"I'm very concerned. It is exactly what we feared."

Read alsoMore police deployed in Istanbul after coup attemptAs UNIAN reported earlier, the Turkish authorities have detained over the weekend some 3,000 military, judges, and prosecutors following a failed coup bid overnight Saturday.

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A U.S.-based Muslim cleric Fethullah Gulen has earlier told the reporters that the coup attempt might have been staged.

In turn, Turkey has accused Gulen of standing behind the failed coup.