Robbers have made off with millions of euros' worth of diamonds and other gems after hijacking a cargo vehicle at Amsterdam's airport.
KLM staff were threatened in the raid
"A KLM Cargo armoured car containing valuable goods was hijacked on the cargo ramp at Schiphol this morning," the Dutch airline KLM said.
Unconfirmed reports say the haul was worth at least 75m euros (£52m; $99m).
The gems were on their way to a flight bound for Antwerp, Europe's diamond capital, when the robbers struck.
Nobody was injured in the raid, KLM said.
The vehicle was later recovered in Hoofddorp, a town near the airport.
Schiphol police told the BBC that the robbery happened just before the "high value goods" were going to be loaded onto the plane and that there were plenty of witnesses.
A team of 25 detectives is investigating the robbery, spokeswoman Frederique Hermie said.