"Long before the assassination of Ali-Mohammadi, the intelligence officials of Israel, the UK and the U.S. had publicly threatened to kill our nuclear scientists," Kowsari was quoted as saying by Press TV.
"They (the assassins) have confessed that they were trained for terror acts by Mossad and all the (terror) equipment were given to them by Mossad," Kowsari, member of National Security and Foreign Policy Commission of Iranian Majlis (parliament), said according to Fars.
"Due to the confessions of the assassins of Ali-Mohammadi, the judiciary system of the country will punish them soon," said Kowsari.
In November 2010, another Iranian nuclear scientist Majid Shahriar was also killed by a bomb attached to his car on the way to his work.
Iranian authorities has been accusing the United States and Israeli intelligence services of behind the assassinations.