Tehran, Iran (CNN) -- A nuclear scientist was killed in a blast in Tehran on Wednesday morning, an Iranian news agency reported, in the latest in a string of attacks that Iran has blamed on Israel. A motorcyclist placed a magnetic bomb under Mostafa Ahmadi Roshan's Peugeot 405, the state-run IRNA news agency said. The blast also wounded two others, IRNA said. State television channel Press TV reported later Wednesday that Roshan's driver, Reza Qashqaei, had died in a hospital from his injuries. Mohammad Khazaee, Iranian ambassador to the United Nations, condemned what he called "cruel, inhumane and criminal acts of terrorism against the Iranian scientists."NEW: Magnetic bombs were used in other Iran assassinations, ambassador saysSecretary of State Hillary Clinton categorically denies U.S. involvement in the killingAn Israeli military spokesman says he does not know who carried out the attackA bomb was put under Mostafa Ahmadi Roshan's car, state-run IRNA news agency says
"But if it is true that Israel is behind it, Iran should make a formal complaint to the _ so they can get an answer from Israel," Ansari said.