A suspect in “Islamist ties” was arrested by German police after an explosion on a bus of the Borussia Dortmund football team.
German prosecutors also said the three explosive devices contained pieces of metal.
According to them, two letters alleging the April 11 attack are being investigated.
Prosecutors see the blasts as a terrorist attack, but say the exact motive is unclear at the moment.
On April 12, German Chancellor Angela Merkel said the attack was a “terrible crime” and praised Dortmund fans and their opponents in the Champions League of Monaco.
Fans later filled Signal Iduna Park in Dortmund for the postponed first stage of the quarterfinals, which started at 18:45 local time.
There was a stormy transfer You will never walk alone both groups of fans before the start.
Earlier, a spokeswoman for the German Federal Prosecutor Frauke Kohler said: “Two suspects from the Islamist spectrum have become the focus of our investigation. Their apartments were searched and one of the two was detained. “
German media report that the detained suspect is a 25-year-old Iraqi, and the second suspect is a 28-year-old German.
The radius of the attack was about 100 meters. Prosecutors said they were lucky that the victims were not the worst.
Frake Kohler said a piece of shrapnel crashed into the headrest of one of the seats in the team bus.
According to her, three copies of the same letter were found near the place of the explosions, which indicates that the attacker had links to ISIS. The terrorist said he attacked a Christmas market in Berlin in December, killing 12 people.
Frake Kohler said the letter required a “recall [German] tornado fighters from Syria and, I quote, the closure of Ramstein Air Base. “
Rammstein is a significant base of the US Air Force. The text is analyzed to see if it is valid.
newspaper southgerman the newspaper reports that the letter began with the phrase “in the name of Allah”.
However, the newspaper said the criminals deliberately tried to mislead the investigation.
A second letter was published online in which left-wing extremist groups claimed to have carried out the attack, but prosecutors had reason to believe that the letter was not valid.
Footballers of “Borussia” from Dortmund were heading to the Champions League match when they detonated three charges of explosives, police said.
Spain international Mark Bartra underwent surgery after breaking a bone in his wrist. The other players were not injured, but a police officer on a motorcycle accompanying the bus was injured by the noise of the explosions.
Several reports said the explosive was hidden in a hedge.
Dortmund goalkeeper Roman Burki told the Swiss news Look that the bus turned onto the main road when a loud noise was heard.
Players leaned on the floor of the bus, not knowing if there would be more explosions, he said.