Police in Norway have launched a major action against illegal poker clubs in Oslo, as the country continues to crack down on gambling that doesn’t bear the government’s seal of approval.

On Thursday, Norwegian media outlet Aftenposten broke the story that around 100 police had staged simultaneous raids against five underground live poker venues in the capital Oslo. The action, which took place around 10:30pm local time, is without precedent, at least in terms of scale.

The five clubs raided were identified as Quads, Sentralen, Fish Club, Akerselva Club and Norwegian Poker Team. All five have been closed. Other clubs in the city are reportedly targeted for future raids.

Police spokesperson Philip Matthew Green told local broadcaster NRK that five individuals had been placed under arrest, suggesting that police were more interested in rounding up each club’s owner/operator and less concerned with punishing individual poker players.