If “measures aimed at immediately stopping the Israeli attacks” fail, “it is highly probable that many other fronts will be opened,” the Iranian foreign minister told Al Jazeera on Oct. 15. “This option is not ruled out, and this is becoming increasingly more probable.”

Iran’s president, Ebrahim Raisi, said on Sunday that Israel’s offensive in Gaza had “crossed the red lines” and “may force everyone to take action,” CNN reported.

“Washington asks us to not do anything, but they keep giving widespread support to Israel,” Raisi warned in a post on social media. 

U.S. National Security Adviser Jake Sullivan told CBS on Sunday that officials are seeing “an elevated risk of this conflict spreading to other parts of the region.”

Iran’s hostility toward Israel goes back more than 40 years, with a proxy conflict having been waged between the two Middle Eastern countries for decades.

The war between Israel and Hamas has reached unprecedented death tolls in the history of Israeli-Palestinian violence.