An unidentified attacker shot dead Iranian Deputy Industries Minister Safdar Rahmatabadi in Tehran on Sunday night, the state news agency IRNA reported.
Witnesses said the incident happened at around 7:50 p.m. (1620 GMT), IRNA said.
"Investigations show that two shots were fired from inside the vehicle," the agency quoted a police official as saying.
"That two shells were found inside the car shows a strong likelihood that the assailant was inside the car and in conversation with Mr Abadi. There was no sign of struggle at the scene of the killing."
Last month, the Telegraph reported that Iran's commander of the Cyber Warfare Headquarters was found dead in a forest outside Tehran.
Mojtba Ahmadi was found with two bullets in his heart, as reported in a website affiliated with the Revolutionary Guard Corps.
Five Iranian nuclear scientists and the head of the country’s ballistic missile program have been killed since 2007. Iran has accused the Mossad, of carrying out these assassinations.