The Shin Bet unveiled an Iranian assassination plot targeting PM Benjamin Netanyahu, Defense Minister Yoav Gallant, and Shin Bet Director Ronen Bar.
The Shin Bet said in a statement on Tuesday that it had seized an explosive device attached to a remote detonation system.
Hezbollah was caught off-guard by a cyberattack on the Lebanon terrorist organization pagers that wounded thousands of members.
Hezbollah members were wounded in Beirut after their communication pagers exploded on Tuesday.
The Shin Bet agency did not name the official. It said in a statement that it had seized an explosive device attached to a remote detonation system that Hezbollah had planned to operate remotely.
Security forces also killed a terrorist who threw explosive devices and dismantled a vehicle rigged with explosives.
Police allege that crucial security warnings about a potential Hamas attack were withheld overnight, raising questions about missed opportunities to prevent the Nova music festival massacre.