The plot to assassinate ambassador Einat Kranz-Neiger began at the end of 2024, Axios cited a source with knowledge of the matter as saying, and was led by a member of the IRGC Quds Force's secretive Unit 11000.
The operative, according to the source, spent several years overseeing agents from Iran's embassy in Venezuela.
"The plot was contained and does not pose a current threat," the outlet quoted a US official as saying.
"This is just the latest in a long history of assassination attempts by Iran around the world targeting diplomats, journalists, dissidents, and anyone who disagrees with them — something that should deeply concern every country where there is an Iranian presence," the US official added, according to Axios.
Israel and Iran have been arch-enemies since the 1979 Islamic Revolution made enmity to the Jewish State a key element of state ideology.
Their confrontation had mostly been contained to indirect fighting between Israel and Iran-backed Islamist armed groups in the Middle East including Hezbollah in Lebanon and Hamas in the occupied Palestinian territories.