The elimination took place overnight during a strike in Khan Yunis in southern Gaza.
US strikes in Yemen take out key Houthi leaders as the group escalates threats, including a blockade on Ben-Gurion Airport and missile attacks on Israel.
Israel has ramped up its military response to Hamas in Gaza, with officials signaling a shift toward full control as hostage negotiations remain stalled.
The military added that Herev was involved in "promoting and directing terrorist plots against the State of Israel" and was "a close associate of leadership figures, including Yahya Sinwar."
The IDF said it "did not strike a UN compound in Deir el Balah," and called on media outlets to act with caution regarding unverified reports.
Sa'ar's comments came as he spoke at a meeting hosted by AIPAC's Board of Directors in Jerusalem on Tuesday evening.
Israel’s shekel fell up to 0.5%, and stocks dropped 1.2% as renewed Gaza strikes ended a fragile ceasefire, raising economic and humanitarian concerns.
The US blames Hamas for breaking the ceasefire in Gaza, backs Israel’s response, and condemns Hamas’s use of civilian sites, says acting UN envoy.
The US launches strikes on Iran-backed Houthis as Gulf nations monitor the impact, seeking signs of deterrence and regional stability.
Among the targets were radars and detection equipment used to assess aerial intelligence.