Town halls were evacuated in cities across Germany after bomb threats were sent overnight, police said.
The threats were received by email in six cities and towns, according to local police forces.
Buildings were cordoned off on Tuesday morning and officers stood guard while sniffer dogs were used to search for explosives.
"A threat against the city of Augsburg has been received, the town hall has been cleared, we are investigating," tweeted police in the southern city.
Police posted similar tweets from western Neunkirchen and Kaiserslautern, eastern Chemnitz, central Goettingen and northern Rendsburg.
Bild daily cited one police force as saying the threat level was unchanged.
It comes after courts in three German cities received bomb threats in January but no explosions occurred.
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