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Iran has blamed Israel for the murder of a nuclear scientist who was killed by a bomb that had been attached to his car.
Mostafa Ahmadi Roshan, 32, died after two unidentified men on a motorbike fastened a magnetic bomb to his vehicle outside a university in east Tehran.
Two others in the car were wounded and taken to hospital. One of them, Mr Roshan's driver, died later of his injuries.
The dead scientist worked at Iran's uranium enrichment facility in Natanz, and officials were quick to put the blame on Israel.
"The responsibility of this explosion falls on the Zionist regime," said provincial governor Safar Bratloo.
"The method of this terrorist action is similar to previous actions that targeted Iran's nuclear scientists."
The car belonging to Mostafa Ahmadi Roshan is taken away after the fatal bombing
Vice president Mohammad Reza Rahimi also pointed the finger at "those who claim to be combatting terrorism" - a thinly-veiled accusation of American involvement.
"They should know that Iranian scientists are more determined than ever in striding towards Iran's progress," he said.
Mr Roshan is the fourth Iranian scientist to have been killed by a car bomb in the capital since early 2010.
The current head of Iran's atomic organisation, Fereydoun Abbasi, escaped another such incident in November 2010, when he managed to scramble out of his car with his wife just before the attached bomb exploded.
Those attacks were viewed by Iranian officials as assassination operations carried out by Israel's Mossad intelligence service, possibly with help from its US counterparts.
Whoever is behind the wave of attacks is clearly having success... But the Iranians will attempt to hit back. The covert war goes both ways.
Sky News foreign affairs editor Tim Marshall
A student protest against the scientists' killings was being planned for Saturday, Iran's Fars news agency reported.
The latest bombing comes amid international tensions over Iran's nuclear programme, which the West believes conceals research to develop an atomic bomb.
Tehran has repeatedly denied that its nuclear programme is for anything other than peaceful purposes.
Despite this, the United States has said "all options are on the table" in terms of dealing with Iran - including military action.
Iran has threatened to close the strategic Strait of Hormuz at the entrance to the Gulf if Western sanctions target its oil industry. About of 20% of the world's oil passes through the narrow waterway.
The latest bombing follows the confirmation by the International Atomic Energy Agency (IAEA) that Iran had started uranium enrichment at a fortified underground bunker in Fordo.
The United States, Britain, France, Germany and Italy viewed that development with alarm, saying it was a violation of UN Security Council resolutions on Iran.