Police in Germany detained six men in connection with a potential terror attack during Berlin’s half-marathon on Sunday.

From the Washington Examiner: “There were isolated indications that those arrested, aged between 18 and 21 years, were participating in the preparation of a crime in connection with this event,” prosecutors and police said in a joint statement Sunday afternoon.

Berlin police said the men were detained after searches in the Berlin districts of Charlottenburg-Wilmersdorf and Neukoelln.

Germany’s Die Welt first reported that one man detained had planned to carry out a knife attack on participants and spectators.

The German newspaper also reported that four men had connections to Anis Amri, a Tunisian who killed 12 people and injured dozens more when he drove a truck into a Christmas market in Berlin in December 2016.

Amri pledged allegiance to the Islamic State.

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