A record amount of cocaine - around 500 kilograms - has reportedly been discovered in crates of bananas at an ALDI supermarket in northern Germany, The Local reported.

Staff at six branches of the discount supermarket chain in Rostock as well as the logistics center in Jarmen discovered the class A narcotics on Wednesday.

The drugs could have a street value of around €25 million (US$28 million), authorities say.

The banana cartons with the cocaine packets allegedly arrived by ship from Latin America. The authority's spokesman did not say which ports they were shipped through.

"We don't have the final quantity yet, because we simply haven't been able to evaluate it yet, because of the quantity," the spokesperson told NDR 1 Radio MV.

But one thing is certain: "This magnitude is really unique for Mecklenburg-Western Pomerania."