Brussels Airport and a Swiss airline are at the epicenter of a multimillion dollar international diamond heist on Monday, Feb. 18, USA Today reports.

According to authorities, a group of eight men cut a hole in a perimeter security fence, drove out to the tarmac and removed diamonds – possibly worth hundreds of millions of dollars – from the cargo of a Helvetic Airways’ Fokker 100 jet operating for Swiss International Airlines.

In a statement, the operating company for Brussels Airport says that there was no shooting and no injuries. The thieves left the way they got in – through the damaged fence. The airport also told FlightGlobal.com that the incident has “had no impact on the continuity of (other) air traffic.”

The armed and masked men used two vehicles for the raid, and apparently they impersonated security personnel to pull it off. They escaped with 120 parcels, mostly containing diamonds but some also holding precious metals.

The efficient operation took only 11 minutes in total, with just three minutes at the plane itself, USA Today reports. Police say they found a burnt-out vehicle near the airport later Monday, but they are still investigating.

The diamonds could be worth anything between $50 million and $350 million, according to various media reports.