Goteberg, Sweden ? Masked gunmen crashed through an airport fence Tuesday, held up luggage handlers unloading crates of foreign currency from an airliner, and left behind a suspicious package that looked like a bomb, police said.

Stunned passengers waiting to disembark the Scandinavian Airlines jet that had just arrived from London witnessed the brazen robbery at the Landvetter airport outside Goteborg, Sweden’s second-largest city.

At least five robbers, some armed with assault rifles, crashed through a gate at the airport and held up the luggage handlers as they were unloading the plane, police spokeswoman Maria Rosenberg said. No one was injured.

It was not immediately known how much foreign currency the robbers stole, but Rosenberg called it “a big sum.”

The robbers left a suspicious package on the tarmac, prompting police to evacuate parts of the airport and call in bomb disposal experts, she said.

The robbery was similar to a 2002 heist at Stockholm’s Arlanda airport in which gunmen stole about $5.6 million in foreign currency being unloaded from a plane. Several suspects were arrested in that case, but all were released due to lack of evidence.