German federal prosecutors announced on Thursday that the main suspect detained over an attack targeting the Borussia Dortmund football team was a member of "Islamic State" (IS) in Iraq.
A UEFA spokesperson said: "The decision to play the UEFA Champions League match between Borussia Dortmund and AS Monaco FC on Wednesday at 18.45CET was made on Tuesday night at the BvB Stadion Dortmund in cooperation and complete agreement with clubs and authorities".
In this February 14, 2017 fie photo, Dortmund's Marc Bartra reacts during the Champions League round of 16, first leg, soccer match between Benfica and Borussia Dortmund in Lisbon.
The prosecutors, however, said there is no evidence he took part in the attack in Dortmund.
"The task of his unit was to prepare abductions, kidnappings, extortions and killings", the prosecutor's office said in a statement.
"He is also said to have fought for unification".
The man travelled to Turkey in March 2015 and from there on to Germany in early 2016. "From Germany the accused continued to maintain contacts with members of "IS". The judge must then decide whether or not to issue the warrant.
One of the letters, published by Bild, starts with the Islamic phrase "In the Name of God, the Most Gracious, the Most Merciful" and demands the withdrawal of German Tornado surveillance planes from Syria and the closure of the US military air base in Ramstein, Germany. "The motives are yet unclear".
Investigators are still puzzling over three copies of a note claiming responsibility for the attack that were found at the scene. "They all had the same content, and an Islamist background can't be ruled out at this point".
Police say the metal-packed devices used in the attack were sophisticated and would have required detailed knowledge of explosives and detonators, suggesting possible military training. "We think about them (Dortmund) of course but we have to carry on and that will happen".