The extremist Islamic State group has published a video in which a man pledges allegiance to IS and vows that Germany's people "won't be able to sleep peacefully anymore".

It appears to be the same as the one found by German investigators on the phone of the man who blew himself up in Ansbach in Bavaria on Sunday night, killing himself and injuring 15 people.

The IS-linked Aamaq news agency released the video early tosday.

The man in the video, his face covered with a black scarf, threatens to make life intolerable and warns: "We will blow up your homes."

German authorities could not immediately be reached to confirm whether the video was the same as the one found on the mobile phone of a 27-year-old Syrian who blew himself up in Ansbach.

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