Haider Syed Mustafa is accused of having collected extensive information for an elite unit of Iran's Revolutionary Guard on Reinhold Robbe, the former head of the German-Israeli Association in Berlin, and Daniel Rouach, a French-Israeli professor from the Ecole Superieure de Commerce de Paris university.
No pleas are entered in the German system and Mustafa refused to make a statement as the trial opened.
According to prosecutors, Mustafa collected large amounts of information including photos and video of the two men, and details of their workplaces, homes, families and acquaintances as well as the neighborhoods and public transportation they frequented. He then allegedly sent the information to a contact called "Mahmud" who passed it on to the Iranian Quds Force unit.
"The al Quds unit has its own agents ... And it considers Israel its arch enemy," Greven said as he read out the indictment.
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Among the reports Mustafa provided were power point presentations highlighting the individuals' security situations, with details of surveillance cameras, security personnel and police details, prosecutors said.
Greven said Mustafa received at least 2,052 euros ($2,170) for his spying activities. He also traveled to Pakistan in October 2015 and February 2016 and from there allegedly continued his travels to Iran where he very likely met with his contact Mahmud, Greven said.
Mustafa faces a possible five years in prison if convicted.