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A German rock festival was evacuated over 'terror threat' as police issued an urgent security warning.

Organisers have asked all music fans to leave the Rock am Ring festival in Nuremburg, Germany.

Festival organisers said on Facebook that police told them to interrupt the festival and vacate the premises as an act of precaution.

Festival goers were advised to leave the grounds in a 'calm and co-ordinated' manner.

Local police said in a statement that the decision to cancel the festival was made due to "concrete leads" that a terror threat could have been planned.

(Image: DPA)

(Image: DPA) (Image: DPA) (Image: DPA)

Rock-am-ring tweeted that they had been instructed by police to temporarily interrupt the festival, and asked people to head in the direction of the camping sites.

More than 80,000 festival goers had traveled to Nürburgring, an arena near the German city of Nuremburg to attend the annual festival, which was scheduled to run until Sunday.

In the wake of last week's terror attack in Manchester, police had already increased security for the festival, with more than 1,200 police officers at the site.

Concertgoers left the site calmly while singing "You'll Never Walk Alone."

German hard rock group Rammstein were set to perform on Friday night.

Die Toten Hosen, System of a Down, the Beatsteaks, Five Finger Death Punch, Frank Carter & The Rattlesnakes, Suicide Silence, and Slaves are among the other acts.

(Image: DPA) (Image: DPA)

(Image: DPA)

Organisers said that they'd hope to continue the festival on Saturday.

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