Protests are continuing in the north-east at the impact on farmers of Dunnes Stores buying milk from Northern Ireland and selling it at knock-down prices.
Close to 40 trolleys were filled with produce from shelves in the Navan branch of Dunnes Stores on Thursday night and then abandoned in the aisles.
A formal complaint was made to gardaí after a similar protest in Dundalk last weekend.
Gardaí in Dundalk confirmed they had started an investigation into the incident during which over 70 trolleys were packed full of frozen foods and left in the aisles.
Sources confirmed that the investigation is examining whether some people, believed to be farmers, will be prosecuted.
The farmers claim that, because Dunnes Stores has cut the price it is paying to its suppliers in the Republic, the suppliers are in turn paying less to the farmers. Two litres of Dunnes Stores own-brand milk can now be bought for 99 cent.
The protests have been taking place across the country including Meath, Louth, Tipperary, Kerry and Dublin and look set to continue.
A spokesman for the Irish Farmers' Association said: "There is huge anger among the 2,500 Irish fresh-milk producers."