The cocaine was found in banana boxes in several branches of the supermarket chain in the cantons of St. Gallen, Glarus, Graubünden and Ticino.
As reported in Swiss news outlet 20 Minutes, at least 50 kilograms was found in one Coop location in Haag, St Gallen.
The drugs were first found in one banana box which had arrived from Amsterdam, after which Coop outlets across Switzerland were told to check all of their banana deliveries.
The cocaine was not hidden in the bananas themselves, but was placed in the boxes – along with notes for how to find it.
The Federal Prosecutor's Office told 20 Minutes that the boxes had arrived from the Netherlands and the cocaine was expected to have arrived via ship from South America.
The estimated street value of the drugs is several million francs.
This is not the first such example in Europe. As reported by The Local in 2019, around 500 kilograms of cocaine was found in banana boxes in northern Germany.
The boxes were delivered to several branches of the German supermarket Aldi.