COPENHAGEN  - Danish police have arrested two employees of Copenhagen airport after seizing 20.5 kilograms of heroin, they said in a statement Friday.

The drug was found on Wednesday hidden in a bag that had arrived from Pakistan.

“This is a huge haul with a street value of at least 25 million kroner (4.5 million dollars), police inspector Knud Hvass said in the statement. Four people were arrested in total — two of them 38-year-old airport staff who were detained on the airport premises.

A third man, also 38, was arrested at his home and a 44-year-old Pakistani national was arrested Thursday in Spain in cooperation with Spanish police.

The statement said he could be extradited to Denmark.