Security officials in Germany say they believe a far-right "guerrilla" group may have been behind a string of attacks in the eastern town of Nauen, near Berlin.

Prosecutors in Brandenburg state are investigating whether a local member of the far-right National Democratic Party formed a group intent on committing crimes against migrants and foreigners.

Brandenburg's Interior Minister Karl-Heinz Schroeter said Friday that a "far-right urban guerrilla" appeared to have been active in Nauen in recent years.

Among the crimes allegedly committed by the group were an arson attack on a gym that was meant to house asylum-seekers, the burning of a Polish man's car and property damage to the offices of a left-wing party.

Germany has seen a surge in far-right attacks over the past year.