Police swooped on the men after several months of investigative work. On Friday a truck traveling to Dalarna was pulled over outside Mariestad in western Sweden.
Inside the vehicle police found a large quantity of cannabis. The driver, 53, was arrested. Police later arrested two more men, 50 and 46, suspected of smuggling drugs into the country. The origin of the drugs is not yet known.
The authorities suspect that more people may be involved and are anticipating further arrests.
It is not believed that the drugs were intended for distribution solely in the Dalarna region.
“It was a bit too big for just Dalarna,” said police spokesman Sven-Åke Petters.
At least one of the men is a known drug dealer and has previous convictions for narcotics offences.