Hundreds of devices take to sky in spectacular show at drone festival in St Petersburg, Russia

Hundreds of drones took to the sky in a spectacular show at the International Drone Festival held in St Petersburg, Russia.

Hundreds of drones took to the sky in a spectacular show at the International Drone Festival held in St Petersburg, Russia.

Footage from May 2 shows the sky lit up with the flying devices that were also used to form various images in the air.