A German-Russian citizen was arrested on Friday, accused of attempting to blow up the Borussia Dortmund team.

According to authorities, the 28-year-old’s plan was to injure and kill the club’s players, drive down its share price and make a huge profit.

The man, identified as Sergei W, was arrested by Germany’s elite anti-terrorism unit at his home near the southwestern city of Tubingen early on Saturday morning.

After several days of speculation in which the attack was attributed to Islamic terrorists, the far right and the far left, Sergei was charged with attempted murder, inflicting serious bodily harm and carrying out an election.

According to Frauke Kohler, the spokeswoman for federal prosecutors, the purchase of “suspicious options” related to Borussia Dortmund shares on the morning of the attack tipped off the investigators.

According to Ms. Kohler, the suspect, after taking out a short-term loan worth several tens of thousands of euros, went ahead and purchased 15,000 put options.

The options would have entitled him to sell shares at a pre-determined price at any point over the next six days – and the more the stock price fell, the more substantial his gain.

Investigators traced the IP address for the purchase, to a hotel in Dortmund. The team had been staying at the hotel before its Champions League quarterfinal match against A.S. Monaco.

The team bus suffered extensive damage in the attack in Dortmund.

A piece of shrapnel was found stuck in the headrest of a seat, suggesting the fatalities could have been more had the bomb gone off a few seconds earlier.

The only player who suffered injuries was Marc Bartra, 26, a Spanish defender.

Bartra was hit by broken glass and sustained injuries to his right arm and wrist, which required surgery.