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An iPhone battery has reportedly exploded in an Apple store in Zurich injuring seven people.

The Switzerland store was immediately evacuated with 50 customers and employees spilling out into Bahnhofstrasse, one of the world's most expensive and exclusive shopping avenues.

The device is reported to have caused one member of staff 'minor burns' and sparked smoke poisoning concerns.

None of the seven injured had to be hospitalised.

Specialists from the Zurich Forensic Institute are investigating what caused the battery to overheat.

Firefighters, several ambulances and an emergency vehicle attended the scene.