Doubts about letters claiming Islamist motive for Dortmund attack - prosecutors
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A view on the damaged Borussia Dortmund team bus after it was hit by three explosions, April 11, 2017.
PHOTO: EPA
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Asked why there were doubts, she said she could not give any more information as the investigation was ongoing.
German newspaper Tagesspiegel said on its website later on Friday it had received an anonymous far-right email claiming responsibility for Tuesday's attack. It said the email referred to Adolf Hitler, railed against multiculturalism and suggested another attack might occur on April 22.
Koehler said prosecutors had received a copy of the letter but she could not comment further.
The Borussia Dortmund players' bus were heading to their stadium for a Champions League match against AS Monaco on Tuesday when three explosions occurred, injuring Spanish defender Marc Bartra.
Experts have been expressing scepticism for days about the origins of the letters claiming responsibility. Security sources have said investigators are looking at whether left or right-wing extremists may have carried out the attack.
A day after the attack, the interior minister of the German state of North Rhine-Westphalia described the letters as "unusual".

