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'Significant doubts' over Dortmund bus bomb attack letter

Borussia Dortmund's bus was hit by the triple blast on Tuesday as the team left a hotel in the German city. Credit: AP

Investigators reportedly have "significant doubts" about the authenticity of letters claiming responsibility for this week's bomb attack on German football club Borussia Dortmund's bus.

Three still-unverified confession letters found at the scene of Tuesday evening's blasts had suggested an Islamic extremist motive.

However a report commissioned by investigators - reported by German broadcasters NDR, WDR and newspaper Sueddeutsche - said detectives now question whether the letter was really written by Islamists.

German prosecutors confirmed on Thursday that a man detained in connection with the bus attack is believed to be a former commando unit leader for the so-called Islamic State in Iraq.

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