A letter found near the scene of last night's attack on the Borussia Dortmund team bus has been published in Germany.
The letter, which is still awaiting official verification, was published by the German Press Agency (DPA) - which also claims a second letter has been found, criticising Dortmund for its failure to tackle racist abuse.
The first letter says all athletes are now targets for attacks, and apparently references the truck attack carried out in Berlin in December, which left 12 people dead.
It reads: "In the name of Allah, the Gracious, the Merciful, 12 disbelievers would be killed by our Blessed Brethren in Germany. But apparently you do not get Merkel around your little filthy subjects.
"Your tornadoes still fly above the ground of the caliphate to assassinate Muslims. However, we remain steadfast by the grace of Allah. From now on, all the disbelieving actors, singers, athletes and all prominent figures in Germany and other cruiser nations are on the death list of the Islamic state.
"And as long as the following demands are not fulfilled:
- Pull off tornadoes from Syria.
- Ramstein Air Base must be closed. "
DPA now claims a second letter has been found at the scene, which could be linked to an anti-Nazi group.
The letter reportedly cites Dortmund's failure to tackle racism as a reason for the attack.
Dortmund's match against Monaco last night was cancelled in the wake of the explosion, which left defender Marc Bartra injured.
The match will be replayed this afternoon.