Policemen stand guard in front of a team bus of French football club AS Monaco at the team's hotel in Dortmund, western Germany, on April 12, 2017, prior to the UEFA Champions League quarter-final, first-leg football match of German first division Bundesliga club Borussia Dortmund vs Monaco, and one day after an attack on Dortmund's team bus. Pic/ AFP 

Dortmund: German police on Wednesday arrested a suspect with "Islamist links" after the previous day's bomb attack on the bus of Borussia Dortmund football club ahead of their Champions League quarter-final first-leg against Monaco here, according to a BBC report.