How Dortmund bus attacker planned to make millions

The suspect bought the options from a computer at the same hotel where the team was staying.

The man arrested over an attack on the bus carrying the Borussia Dortmund football team allegedly hoped to make millions off an expected slump in the club's share price by using an obscure financial trade, a "put option".

Such trades are typically used by professional traders at banks or investment firms, suggesting the bomber had some experience with financial markets.