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German special forces detained the 27-year-old in the town of Eisenhuettenstadt, east of Berlin and near the border with Poland.

Police said he is suspected of stockpiling materials that could be used as explosives.

The spokesman declined comment on whether there was any connection to Islamic State but he is said to have links to Salafism, an extreme form of Islam which ISIS has its roots in.

He is believed to have been storing material ahead of a planned attack. Police have not revealed details of the plot.