Tourists in Greece have been warned against buying certain products amid contamination fears

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Images on social media appear to show members of the Black Green Arsonists anarchist group injecting hydrochloric acid into bottles of Coca-Cola, cartons of milk and packets of meat.

Shops across the country have been forced to pull certain products from the shelves amid fears of contamination.

It is thought the group took popular items from shops several weeks ago before injecting them with the acid and discreetly returning the products to the shelves in the runup to Christmas.

Authorities believe the products in question are in circulation in the capital, Athens, and Greece’s second-largest city, Thessaloniki.