Iran says one of its nuclear scientists has been “assassinated” in Tehran.

State media reports say the scientist was killed in front of his house on Saturday by unidentified assailants who were riding motorcycles.

The ISNA news agency has identified the scientist as Daryoushi Rezaie. The report says his wife was injured in the attack.

Last year, Iranian officials blamed Israel for bomb attacks that killed a prominent nuclear scientist and wounded another.

State media reports said one explosion killed nuclear scientist Majid Shahrairi and a separate blast wounded nuclear physicist Fereidoun Abbasi. The reports say in both cases, attackers on motorcycles attached bombs to the scientists' cars.

The intelligence ministry later said authorities had arrested more than 10 suspects in connection to the attacks. It said the suspects were linked to Israel's Mossad spy agency. Israel denied involvement in the incidents.

Tensions have been high between Iran and many western nations that suspect Iran is working to develop nuclear weapons. Tehran says its nuclear program is peaceful.