The attack left one player seriously injured when the windows of the bus shattered. A police officer accompanying the bus was also injured.
Federal prosecutors said the suspect, identified only as Sergej W in keeping with German privacy law, was arrested by a police tactical response team in the Tuebingen area on Friday afternoon (NZT). "He was charged with attempted murder, production of an explosive device and infliction of unsafe body injury", the statement read.
The prosecutor's office says Sergey W. had bought 15,000 shares in the club just before the bombing, and planned to speculate on them if the stock price plummeted.
According to the investigation, the suspect had bought 78,000 euros ($84,000) worth of shares in the club online from the team's hotel.
He had reserved the room in mid-March for the periods April 9-13 and 16-20 - coinciding with the team's two scheduled matches against Monaco, though it was not yet clear at the time which one would be held in Dortmund.More news: Sale's 13 Ks, Betts' 2B In 10th Lead Red Sox Over Jays
He stood to gain 3.9 million euros if the plan had come off.
The German attorney general explained: "In the event of a massive decline in Borussia Dortmund shares, the profit would have been multiplied by the provisional calculations".
If the shares of Borussia Dortmund had fallen massively, the profit would have been several times the initial investment.
The explosives, which went off shortly after 7pm (5pm GMT), were hidden in a hedge and were set off as the bus passed. The explosives were remotely triggered, and some metal rods were found as far as 250 metres away.
Today it emerged that hotel staff saw the suspect calmly enter the hotel restaurant and order a steak as guests fled in panic following the nearby detonations.More news: Penguins at Maple Leafs
However, they were seeking an arrest warrant to keep the man in detention over allegedly having been a member of the Islamic State of Iraq and the Levant (ISIL) group.
The Federal Prosecutor's office reiterated on Friday that there are "strong doubts over a radical Islamist background" of the attack.
We would like to thank them for that massively and hope that with this suspect the responsible person for that frightful attack on our team and staff has been found. Find us on Facebook too!
Marcel Schmelzer applauds the crowd after the Champions League quartefinal.
German Interior Minister Thomas de Maiziere praised the action of arrest as "great success", saying via twitter that, it would be notably despicable motive for that crime, if the accusation was eventually confirmed.More news: Anaheim Ducks douse Calgary Flames 3-1 to complete playoff series sweep
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