A man has been charged with 28 counts of attempted murder after allegedly detonating three bombs targeting Borussia Dortmund's team bus.

Three explosions rocked the German team's bus on 11 April as it drove players to the Westfalenstadion ahead of the first leg of their Champions League quarter-final tie with AS Monaco.

Initially, three identical letters left at the scene suggested that the attacker was a terrorist, sympathetic with Islamic State. However this was later discounted.

According to the Dortmund prosecutor's office, the 28-year-old who was subsequently arrested on suspicion of carrying out the attack had conducted it for a financial motive.

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Image: Prosecutors believe the attack had a financial rather than terror motive

The suspect had bought so-called "put" options on the day of the bombings which would have allowed him to sell shares at a pre-determined price.

Prosecutors believe that the man intended his attack to force the club's share price down, allowing him to turn a dramatic profit on his investment.

Investigators identified the suspect when they traced the computer used to purchase the put options to the hotel the team were staying at and found he had booked a room there himself.

The prosecutor's office said that the man, who is a dual German and Russian national identified as Sergei V, was also being charged with inflicting grievous bodily harm and with causing an explosion.

It said that it could not provide further details on the charges until the charge sheet had been delivered to the suspect and his defence lawyers.

Dortmund's Spanish defender Marc Bartra was wounded in the explosion, which caused the game to be delayed by a day - prompting the home team's supporters to offer travelling fans a place to stay for the night.

AS Monaco would eventually win both legs of the tie.