The investigation is focused on two suspects from the “Islamist spectrum,” spokeswoman Frauke Koehler said. Their homes have been searched and one has been temporarily detained, she said.
Three explosive devices shattered windows and injured a player on the Borussia Dortmund team bus Tuesday evening local time as the German squad was en route to its home Champions League match against AS Monaco.
The devices, which were hidden behind a hedge, contained pieces of metal and had a reach of 100 meters (109 yards), the prosecutor’s office said.
Based on the type of detonator and explosive involved, German authorities assume “terrorist involvement” but the motives are unclear, Koehler said.
Letter threatens sporting figures, celebrities
One of two claims of responsibility for the attack — found in three copies of the same letter left at the scene — purports to be from an ISIS sympathizer, according to a copy of the document obtained by CNN from a source knowledgeable about the investigation.
German Tornado jets have been carrying out surveillance over Syria since January 2016, regularly taking photos of potential targets for anti-ISIS coalition airstrikes.
The letter also says that famous sporting figures, actors, singers, and celebrities in Germany and “other Crusader nations” are, from now on, on the “death list of the Islamic State” unless these requirements are fulfilled.
The letter appears to have been written by a non-native German speaker or someone trying to pass themselves off as a non-native German speaker.
A second claim of responsibility, apparently from the far-left, has been circulating online, the prosecutor’s office said, but there are doubts about it.
The match, postponed in the wake of the attack, will be played Wednesday night amid tight security. Fans will not be able to bring backpacks into the Borussia Dortmund stadium, Westfalenstadion, also known as Signal Iduna Park.
Dortmund chief executive Hans-Joachim Watzke said he had paid a visit to the Borussia Dortmund team on Wednesday morning and that it was a difficult time for the club.
“I’ve called on them to show everyone out there that we will not give in to terror,” he said.
State interior minister for North Rhine-Westphalia Ralf Jaeger, speaking in Dusseldorf earlier, said the number of police had been increased significantly in Dortmund ahead of the rescheduled game.
Jaeger said the perpetrators likely targeted the team in order to get as much attention as possible and to try to make people feel frightened and unsafe.
He said the German interior minister would attend the match and that “we’re keeping our fingers crossed for the team.”
Jaeger said investigators were looking into all possible motives. “It could be extreme left, extreme right, someone who is violent, Islamists — police need time to carry out their investigation,” he said.
Chancellor Angela Merkel was “horrified” by the news of the “repugnant” attack, spokesman Steffen Seibert said.
Spanish defender Marc Bartra, 26, suffered injuries to an arm and hand, the team said. Bartra, who has played 29 games in all competitions for Dortmund this season, was treated at the scene and hospitalized.
The team later said Bartra was in surgery for a broken radius — a bone in the forearm — and for “bits of debris lodged in his hand.” He will not play Wednesday.
“We hope that he will make a speedy recovery,” Dortmund captain Marcel Schmelzer said on the team website. “The prevailing mood in the Black and Yellow camp seems to be to play the match tomorrow for Marc.”
Bartra posted on social media Wednesday afternoon saying he was “doing much better.”
“Thanks for all your messages! All my strength to my team mates, fans and to @BVB for tonight!” he tweeted, using another name for his team.
Some Germans opened their homes to Monaco supporters who found themselves without a place to stay on Tuesday night after the match was rescheduled.