Migrants aged between 16 and 21 years, coming from different countries, attend a lesson on basics in law by Bavarian Justice Minister Winfried Bausback (unseen) at a trade school in Ansbach, Germany, January 11, 2016.
Order was restored in the camp after the coast guard intervened, the newspaper said, adding that one police officer was injured.
Some 650 undocumented migrants and refugees are provisionally detained at the Leros camp.
Hundreds of migrants coming ashore on the Greek islands find themselves locked up for months at so-called hotspots.
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