U.S. State Department on Monday (7/25/2011), denied the country was embroiled murder Iranian nuclear scientists recently. Washington urged Tehran not to take advantage of the event "to attract attention".

"We are not involved," said a spokesman for the U.S. State Department, Victoria Nuland, told reporters in Washington, in response to the death of Dariush Rezaei, Iranian nuclear scientist who was killed in eastern Tehran, Saturday (23 / 7). He said Iran was "often take measures to accuse the West" for all types of such incidents.

"We hope that Tehran has no plans to exploit the incident to draw attention away from what needs to be done, ie return to meet international obligations," Nuland said.

Chairman of the Assembly (Parliament) of Iran Ali Larijani called the killings as US-Zionist terrorist acts, as the satellite channel Press TV reported on Sunday.

There has been a series of assassination attempts against Iran's nuclear scientists in recent years later.Pada January 2010, an Iranian scientist and professor of physics at the University of Tehran, a prestigious, Massoud Ali-Mohammadi, was killed by a bomb air controllers much tied to a parked motorcycle near his home. In November 2010, another Iranian nuclear scientist, Majid Shahriar, also was killed by a bomb planted in his car on his way to work.

In January, Iran said Tehran disarm the Israeli spy ring and arrested a group of people who were involved in the murder of scientist Massoud Ali-Mohammadi.