Hundreds of mourners that gathered for a traditional Greek Orthodox funeral service near Athens were in for a surprise when they were served cocaine-coated biscuits, radio reports said.

Relatives of the deceased had ordered the traditional biscuits or "kouramiedes" for the reception following the service from a local bakery, whose workers, it turned out, also collaborate with a Bulgarian drug smuggling ring.

The drug traffickers attempted to smuggle more than 60 kilos of cocaine by decorating hundreds of biscuits with the powdery drug, in place of sugar icing.

One of the employees at the bakery mistakenly delivered the wrong biscuits to the funeral, which were devoured by the unsuspecting mourners.

The mix-up put police on the trail of the bakery and to the arrest of the drug traffickers.

- AAP