The IDF explained that the operation was intended to reduce Hezbollah's ability to harm Israel by striking arms transfers and intelligence centers in Syria.
The sophisticated equipment destroyed in the attack was essential for shaping and testing plastic explosives that encase uranium in a nuclear device.
The delegation claimed that, as diplomats, they should enjoy immunity and do not need to be searched.
The US charged an Iranian man last week in connection with an alleged plot to assassinate President-elect Donald Trump.
"The world is pregnant with anti-Zionist sentiments, and there is a place for an international anti-Zionist movement to be launched by Iranians inside and outside the country all over the world."
Iran's foreign minister told International Atomic Energy Agency chief Rafael Grossi that Tehran is willing to resolve outstanding disputes over its nuclear program but won't succumb to pressure.
The strike dealt a severe blow to Iran’s nuclear development efforts, according to the officials cited in the report.
Ali Larijani, an advisor to Iran's supreme leader, spoke during a visit to Beirut as Israel kept up its intensified bombardment of Hezbollah-controlled areas of the Lebanese capital.
Syria is likely also to continue to be a hunting ground for Israeli air power working its way down the long list of Hezbollah and Iranian targets in the country.
The newspaper reported that the meeting was a discussion of how to defuse tensions between Iran and the United States.