Investigators found near the scene a handwritten letter that claimed responsibility for the attack, prosecutor Sandra Luecke said. Dortmund police Chief Gregor Lange said police have not ruled out any possible motives for the attack, which led to the match being postponed until Wednesday night. Marc Bartra of Borussia Dortmund was injured in the blasts, the team says. Twenty-six-year-old Spanish defender Marc Bartra suffered injuries to an arm and hand, the team said. Bartra, who has played 17 games in all competitions for Dortmund this season, was treated at the scene and hospitalized.

Source: CNN April 11, 2017 18:38 UTC