Turkish tech and aerospace festival Teknofest Istanbul hosts World Drone Cup.
The six-day festival, jointly organised by the Turkish Technology Team Foundation and Industry and Technology Ministry, is expected to attract at least one million visitors.
Teknofest Istanbul, aimed at promoting and showcasing Turkey's rapid advance in technology, has come to an end after four days.
President Recep Tayyip Erdogan lauds the country's first aerospace and technology festival and achievements made in the defence industry.
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