Over 100,000 revelers have reportedly been evacuated from the Rock am Ring festival in Germany late Friday evening after a reported bomb threat.

AP is reporting, the dpa news agency reported Friday that popular annual festival was was being cleared out on its opening night after Koblenz police said they’d received information of a “concrete threat.”

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Witnesses on social media was an “army” of police could be seen invading the area. Dozens of ambulances were al so observed on scene.

According to the Rock am Ring music festival’s Facebook page, “a terrorist threat the police have advised us to interrupt the festival.”

Those at the festival were asked to evacuate the Nürburgring, a motorsports complex which can hold up to 150,000 attending a festival such as this one, located in the town of Nürburg, Rhineland-Palatinate, Germany.

Those at the festival reported seeing a near army of police officer and emergency officials flooding into the area. One person on social media noted that they have never seen so many ambulances in one place before this.