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ANKARA, Turkey – Turkish Airlines says a Basel, Switzerland-bound flight is returning to Istanbul after a note saying there was a bomb on board was found in a toilet.

The airline said Friday Flight TK1923 with 151 people on board was heading back to Istanbul to be searched.

It was the third such incident in recent weeks. On March 30, the company diverted an Istanbul-to-Sao Paulo flight to Morocco after finding a note with the word “bomb” in the toilet. No bomb was found. A day earlier, a flight to Tokyo also returned to Istanbul before being cleared.

Turkish Airlines says it is standard procedure to make emergency landings under such circumstances.