TEHRAN, Iran (CNN) -- Three alleged spies who are accused of working for Israel's Mossad intelligence agency were arrested by Iran's Islamic Revolution Guards Corps, the semi-official Fars News Agency reported Tuesday.

"Members of this network were in direct contact with Mossad," Tehran's prosecutor, Saeed Mortazavi, told Fars. "These individuals have received training in bombings and assassination in the cities of Herzliya and Caesarea (Israel)."

The suspected spies had 17 training sessions, he said.

IRGC Commander Maj. Gen. Mohammad Ali Jafari told Fars on Monday that his troops had arrested members of an Israeli spy network who collected and transferred information about Iran's nuclear and military centers.

The news agency said it was not clear if Jafari and Mortazavi were speaking of the same people. Jafari said more details would be forthcoming, Fars said.

Don't Miss Iran executes man in Israeli spy case

Last week, Iran executed a man convicted of spying for Israel, state media reported. Ali Ashtari, 45, was convicted by Tehran's Revolutionary Court in June of spying for Israel's intelligence agency, Mossad, in exchange for money, according to Iranian media.

According to Ashtari's "confession," published by Fars, he was a salesman who obtained high-end but security-compromised pieces of electronic equipment from the Mossad and sold them to military and defense centers in Iran.

Iran and Israel have been engaged in an escalating war of words. Iran accuses Israel of trying to destabilize the republic. Israel has not ruled out military action to halt Iran's nuclear aspirations.

CNN's Shirzad Bozorgmehr contributed to this report.