German police have arrested a man alleged to have planned a bomb attack during Borussia Dortmund's upcoming home match against Hannover at the Signal-Iduna-Park.
A Bild report has revealed that on Thursday, police found two holes in the ground - one in nearby Krefeld, another in Dortmund near the stadium - where weapons and explosives were hidden.
A single offender, a 25-year-old German citizen, is said to have planned the attack. He was arrested in a Koeln hotel by BKA (German federal police) officers on Tuesday, but reports of his incarceration were only revealed on Thursday. The BKA is said to have known of the planned attack since February.
Police have revealed that the perpetrator intended to attack fans as they arrived at this Saturday's Bundesliga match between league leaders Dortmund and their third placed opponents, Hannover.
Authorities believe that the planned assault was meant to be the starting point for a blackmail attempt. It is still unclear as to whether the explosives found were at all in operational order, but after an initial assessment, they were not deemed to pose an acute risk to the population.
Dortmund have drawn sell-out crowds of 80,720 visitors in nine of their 13 home games this year, and have averaged 78,798, the most in Europe. Their clash against Hannover is expected to sell out, meaning that the German police have avoided a potentially catastrophic disaster.