"A referendum in which the colonists will take part, the descendants of those who evicted the true inhabitants of those islands, means a disrespect to intelligence and to national and international law," Mr Boudou said on Sunday.

"No brand of pirates will get hold of the sovereignty and dignity of the Argentine Republic," added Mr Boudou, who ha been in charge of the executive during President Cristina Kirchner's trip to Asia.

The Government of the Falkland Islands has arranged for outside observers to monitor the referendum in order to prove it is free and fair.

The announcement comes after defence chiefs drew up new contingency plans designed to scupper any possible hostile action by Argentina, which could include a stunt by radical elements.

Mrs Kirchner's overseas tour concludes on Monday in Vietnam.

She has repeatedly called for Britain to honour a 1965 United Nations resolution to start negotiations over the Falkland Island's sovereignty.

Prime Minister David Cameron has dismissed Kirchner's demands for the "return" of the Falkland Islands insisting its people have shown "a clear desire to remain British".

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Argentina attacks Falkland Islands referendum