Customs inspectors searched the offices Nov. 30 on suspicion that trucks officially bound for Saudi Arabia were instead delivered to Iran, Stuttgart prosecutors' spokeswoman Tomke Beddies said. Beddies said that the company itself had alerted the authorities to the delivery.
Prosecutors are still investigating who at the company was aware of the delivery.
"The names of those responsible are not known," Beddies said.
Beddies would not comment on specific details of the case, but the Focus weekly reported that the case concerns 453 trucks that could be converted for military purposes.
DaimlerChrysler supports the investigation, the company said.