To facilitate their escape, the perpetrators scattered nails along their path. A motorcycle and a police vehicle suffered punctures.
The offenders, hooded and wearing bulletproof vests, were armed with long guns. They entered the premises while employees were present.
The five suspects were not arrested at the scene. The investigation is ongoing.
The events took place in the presence of employees, at the moment of the intrusion into the company.
The theft involves several dozen kilos of precious metal, a range of 20 to 50 kilos of gold, in addition to the jewelry taken.
Five armed men burst in early Tuesday into a jewelry factory in Besançon and made off with between 20 and 50 kilos of gold as well as jewelry, according to a source close to the investigation contacted by franceinfo. According to this source, five of them entered the factory. They then left with the loot.