'Greece's largest police union has threatened to issue arrest warrants for officials from the country's European Union and International Monetary Fund lenders for demanding deeply unpopular austerity measures.

In a letter obtained by Reuters on Friday, the Federation of Greek Police accused the officials of "...blackmail, covertly abolishing or eroding democracy and national sovereignty" and said one target of its warrants would be the IMF's top official for Greece, Poul Thomsen.

The threat is largely symbolic since legal experts say a judge must first authorize such warrants, but it shows the depth of anger against foreign lenders who have demanded drastic wage and pension cuts in exchange for funds to keep Greece afloat.'

Read more: Greek Police Union Wants to Arrest EU/IMF Officials