Germany's Military Counterintelligence Service (MAD) is widening its investigation into far-right extremists within the Bundeswehr, Germany's armed forces, German media reported on Tuesday, particularly focusing on the most elite unit in the military, the Kommando Spezialkräfte (KSK),which is based in the southwestern city of Calw.

The number of soldiers in the special forces unit believed to harbor fringe far-right sympathies is "extraordinarly high," security sources told Spiegel magazine.

According to the Redaktionsnetzwerk Deutschland news organization, the problem is particularly bad among paratroopers and known to center around the Franz-Joseph-Strauss base in Altenstadt, Bavaria. The base became infamous in the 1990s when MAD discovered that soldiers there were celebrating Hitler's birthday and singing the anthem of the Nazi party.

Read more: Deutsche Welle