Iran’s state television has reported that Tehran has evidence that the United States was behind the latest assassination of one of its nuclear scientists.

Earlier this week, an Iranian nuclear scientist was killed in a bomb blast in Tehran.

It was the fifth attack of its kind in two years.

Iranian state-run television reported that the Iranian Foreign Ministry gave a letter to the Swiss ambassador in Tehran which says: “We have reliable documents and evidence that this terrorist act was planned, guided, and supported by the CIA.”

The Swiss Embassy represents U.S. interests in Iran.

Tehran and Washington have no diplomatic ties.

The United States has denied involvement in the killing and condemned it.

Israeli President Shimon Peres has said Israel had no role in the attack, to the best of his knowledge.

compiled from agency reports