Police in Germany are investigating a far-Right claim of responsibility for last week’s bomb attack on a Borussia Dortmund team bus, amid growing doubt over whether it was the work of Islamic State.
A anonymous email sent to Tagesspiegel newspaper on Friday claimed responsibility on behalf of a far-Right group and threatened a further attack in Cologne next weekend.
Police are taking the new claim seriously but there are believed to be doubts over the authenticity of the email.
Marc Bartra, a centre-back for Borussia Dortmund, suffered injuries to his hand when remote control bombs were set off as the team bus was leaving a hotel on Tuesday.
The new email, which praises Adolf Hitler and rails against mulitculturalism, claims the Dortmund attack was a “final warning”.
It threatens an attack on protestors who plan to demonstrate against the far-Right Alternative for Germany (AfD) party’s conference in Cologne next Saturday.
The email comes as prosecutors confirmed there are serious doubts over a letter found at the attack site which claims responsibility in the name of Islamic State in Iraq and the Levant (Isil).
A spokesman for prosecutors has confirmed German press reports that experts who have examined the letter have “significant doubts” over the claim.
The doubts are believed to centre on demands made in the letter and the language, both of which are out of character for Isil.
An Iraqi man living in Germany has been arrested in the wake of the bombing, but prosecutors say they have no evidence linking him to the attack.
Instead he is being held on charges that he commanded an Isil unit in Iraq prior to 2014.
There have now been conflicting claims of responsibility from Isil, the far-Right and the far-Left, and police have admitted they are no closer to identifying the real culprits.
“Dortmund is known to suffer from a far-Right scene, so investigations have to be pursued in that direction as well,” Sebastian Fiedler of the German police union said.
Investigators have largely discounted a claim on behalf of the far-Left “Antifa” movement as an obvious forgery.
One scenario being examined is that the attack may have been the work of independent Islamic extremists inspired by Isil, but not linked to the group.
Other possible suspects include football hooligans or organised crime gangs.
The explosives were reportedly similar to those used in a car bombing which killed a man in Berlin last year.
The victoim had a history of drug crime, and the incident is believed to have been the work of a crime gang.