German football club, Borussia Dortmund's team bus was hit by three explosions while on its way to the Champions League quarter-final first leg match against Monaco on Tuesday evening, leaving one player injured in hospital.
German security sources said it was a targeted attack on the team bus, shattering one of the vehicle's windows. Police said "serious explosive devices" were used.
There were reports the devices, which were concealed in a hedge, could have detonated by a mobile phone or a garage door-opening device.
There was a letter left near the scene of the attack on Tuesday which claimed it was in retaliation for German military reconnaissance missions against Islamic State in Syria.
The Federal Public Prosecutor said in a statement it had taken over the investigation and would hold a news conference soon.
High levels of security were in place across the city on Tuesday night and there will be a large security force presence at Wednesday night's game, police said, adding they did not not want to jump to conclusions that the attack was terror-related.
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