Security has been stepped up for employees of a German magazine and for members of a small far-right party after a known terrorist called for them to be killed in a video online, officials said Tuesday.

The video surfaced May 18 on YouTube following street clashes between an ultraconservative Muslim group and the far-right Pro NRW party in Bonn and Solingen, in western Germany.

Three security officials, speaking on condition of anonymity because of the sensitivity of the issue, said they have no specific evidence that attacks are being planned in the wake of the video. But they said they worry it could inspire a lone-wolf type attacker like Arid Uka, an Islamic extremist who killed two U.S. airmen at Frankfurt airport last year after being spurred to action in part by a YouTube video preaching jihad, or holy war.

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