The Turkish airlines flight #TK1672 had already begun rolling on the tarmac when it was forced to make an emergency stop.
Officials at Cologne-Bonn airport the anonymous threat appeared serious enough to force an emergency stop and conduct a comprehensive search of the aircraft.
“From the telephone call, it was clear the caller was targeting a Turkish Airlines flight,” a Federal Police spokesman said.
The 111 evacuated passengers were ushered back to a waiting room inside the terminal.
Officers with sniffer dogs continued to search the plane, which by Thursday afternoon remained stationed outside of Terminal 2.
The Airbus A321 (reg. TC-JRO) was initially scheduled to depart at 10 a.m. (0800 UTC) on Thursday.