One player is said to have sustained "superficial" injuries and the match has since been postponed
Three explosions have gone off near the Borussia Dortmund team bus in Germany.
The club say one person - Spanish defender Marc Barta - has been injured. His injuries are said to be superficial after being hit by shards of glass from the vehicles broken windows.
"Bomb explosion on the team bus at the team hotel," a tweet from the club's official account read. "Players in security. No danger at the stadium. More information to follow."
Bombenexplosion am Mannschaftsbus am Mannschaftshotel. Spieler in Sicherheit. Keine Gefahr im und am Stadion. Weitere Infos folgen. #bvbasm— Borussia Dortmund (@BVB) April 11, 2017
The explosion took place 10km from the stadium, where the team is due to face Monaco in the quarter-finals.
The match has been postponed and will take place on Wednesday evening instead.
An image of the Borussia Dortmund team bus. Image: Martin Meissner / AP/Press Association Images
Borussia Dortmund had said there was no danger at the game venue. It is not known what caused the blast.
The club thanked Monaco supporters for their "patience and understanding" and for chanting "Dortmund! Dortmund!" when the reason for the postponement was announced.
Dortmund recommended that fans stay in the stadium and remain calm to allow an "orderly departure".
North Rhine-Westphalia police spokesman Gunnar Wortmann said there were "three explosions near the team bus as they left the hotel to go to the stadium".
Police Dortmund said in a statement: "In the run-up to the Champions League game between BVB (Dortmund) and AS Monaco, there was just after 1900 tonight an explosion close to the BVB team bus."
The statement added: "According to what we currently know, the wheels of the bus (totally or partly) burst and one person was injured.
"It is not yet possible to say exactly what the explosion was or exactly where something exploded."