The investigation surrounded the suspicion of a terrorist organisation being formed, Xinhua quoted a spokesman for the office as saying on Thursday.
The report states that five terrorists had placed explosives in the stadium and targeted a train station in Hanover.
According to the report, the warnings were based on information from a foreign intelligence service, which said during the game, bombs would be detonated in the stadium over a match between German and Netherlands.
On Tuesday in a very short notice before kick-off due to safety reasons, the football match between German and the Netherlands was called off by German authorities.
However, no suspects have been arrested so far and no explosives were found. So it could be even myth , spread in order to create fear in the minds of people.