Hundreds of mainly young left-wing activists gathered and marched on a main street shortly before midnight on Tuesday in the first major protest ahead of the summit, which will be attended by U.S. President Donald Trump, Russian President Vladimir Putin and Turkish President Tayyip Erdogan.
Der Spiegel magazine reported that the Germany army fears protesters will use unarmed drones and that it has deployed a radar to locate any possible aerial intrusions.
A spokesman for the German military declined to confirm the report.
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