The Houthis have threatened to resume attacks on ships in the Red Sea and against Israel, the Associated Press reported, citing two senior representatives of the Iran-backed Yemeni group, BTA reports.
The Houthis have strongly criticized the airstrikes that the United States and Israel have begun to carry out on Iran.
"Hamas", for its part, condemned "American-Zionist aggression", reported Agence France-Presse.
The Palestinian Islamist movement, which is also an ally of Iran, described the strikes as "an attack on the entire region".
Earlier, the pro-Iranian paramilitary group in Iraq "Kataib Hezbollah" threatened to immediately shell US military bases.
Lebanese Prime Minister Nawaf Salam warned that he would not allow anyone to drag "the country into adventures that threaten its security and unity".
Reuters defines this statement of his as a veiled allusion to "Hezbollah".
The leader of the Iranian-backed Lebanese movement, Naim Qassem, meanwhile, canceled his planned speech for today, which was to be broadcast on television.
The Iraqi paramilitary group "Kataib Hezbollah" announced today its intention to immediately launch attacks on US military bases in response to airstrikes on the Iraqi military base where its headquarters are located, Agence France-Presse reported.
"We will soon begin attacking US bases in response to US aggression," the group said in a statement.
Two Kataib Hezbollah fighters were killed today in airstrikes on the "Jurf as-Saher" base in southern Iraq, also known as "Jurf an-Nasr".
This morning, Israel and the US began joint strikes on Iran.
Earlier today, Lebanese Prime Minister Nawaf Salam said he would not accept anyone dragging "the country into adventures that threaten its security and unity" in an indirect message to the Lebanese Shiite group "Hezbollah", Reuters reported.
American air defense systems have been activated over the northern Iraqi city of Erbil, in the Kurdish semi-autonomous region, journalists from Agence France-Presse reported in the meantime.