With Dortmund players due back on the pitch in the Bundesliga, police are pursuing leads regarding the attack on Tuesday that injured Spanish international Marc Bartra and a policeman.
Three bombs containing pieces of metal detonated minutes after the team bus left a hotel for a Champions League match against Monaco.
The Tagesspiegel newspaper revealed it had received a new letter, apparently from far-right circles, railing against multi-culturalism, saying it had been behind the triple blast and threatening another attack.
Several such claims have already been investigated without any breakthrough.
Three identical letters found close to the site had initially suggested an Islamist link, but questions have arisen about the authenticity of that claim.
A sole suspect - an Iraqi man - taken into custody over the Islamist link has since been cleared of involvement and a second claim, purporting to be from the far-left, was made online, but prosecutors had cast doubt on it early on.
The team is gearing up to host Eintracht Frankfurt in the Bundesliga today, when six other league games are also to be played under heightened security.
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