An "Islamist" suspect has been detained by police investigating a bomb attack on the Borussia Dortmund team bus.
"Two suspects from the Islamist spectrum have become the focus of our investigation. Both of their apartments were searched, and one of the two has been detained," said Frauke Koehle, from the federal prosecutor's office.
She said the explosives used in the attack contained metal pins - one of which buried itself into a headrest on the coach - adding it was lucky "nothing worse happened".
Three identical letters left at the scene of the blasts linked the attack to German involvement in the fight against Islamic State in Syria.
They mentioned the
Berlin Christmas market attack carried out by an IS-inspired terrorist in 2016, according to the Sueddeutsche Zeitung newspaper.
The letters, reportedly written in German, began: "In the Name of Allah, Most Gracious, Most Merciful."
The threat would last until German planes are withdrawn from the war zone, and the US airbase at Ramstein, near the French border, is closed. the letters added.
They were found near the team coach and their authenticity is being verified, as detectives have not ruled out the possibility that it might be a deliberate attempt by the attackers to mislead investigators.
A fourth letter, posted online, claiming responsibility which could have come from anti-fascists has been discounted by police following "serious doubts" over its authenticity
Borussia Dortmund president Reinhard Rauball said he was confident the team would rise to the occasion when they do take to the field, despite the ordeal.
"How is the team doing? You can imagine yourself whether they slept well or badly," he said.
"This is certainly a difficult situation for the team which, I think, has not experienced such a situation before.
"However, we expect and I am confident that the team will do its best and deliver a spectacle in the Champions League this evening."
Monaco fans were offered a place to stay for the night by Borussia Dortmund supporters on social media after the match was postponed for 24 hours.
The German club sent out a tweet about the scheme under the hashtag #bedforawayfans.
Fans of both clubs posted pictures of themselves enjoying meals and a drink together.
Monaco also offered its fans €80 each to stay in a hotel for the night.
http://news.sky.com/story/borussia-dortmund-team-bus-attack-police-probing-islamist-link-10834285