By Friederike Heine BERLIN (Reuters) -Far-right party Alternative for Germany filed a lawsuit on Monday challenging a decision last week by Germany's domestic intelligence agency to classify the party as an extremist organisation.

Germany's Alternative für Deutschland (AfD) party has been designated as right-wing extremist by the country's federal office for the protection of the constitution.

Germany’s main opposition party Alternative for Germany challenged a ruling by the nation’s domestic intelligence agency that classified it as a right-wing extremist movement.