Israeli strikes hit several sites in southern Syria overnight, including in the city of Daraa.

The Israeli military said it was hitting “command centers and military sites containing weapons and military vehicles belonging to the old Syrian regime, which (the new army) are trying to make reusable.”

The United States and Iran-backed Houthi rebels in Yemen are both vowing escalation after the U.S. launched airstrikes to deter the rebels from attacking military and commercial vessels on one of the world's busiest shipping corridors.

The Houthi-run Health Ministry said the U.S. strikes killed at least 53 people, including five women and two children, and wounded almost 100 in the capital of Sanaa and other provinces, including Saada, the rebels' stronghold on the border with Saudi Arabia.

The United States under President Donald Trump has launched a new campaign of intense airstrikes targeting Yemen's Houthi rebels.

This weekend's strikes killed at least 53 people, including children, and wounded others. The campaign is likely to continue, part of a wider pressure campaign by Trump now targeting the Houthis' main benefactor, Iran, as well.

Israeli Prime Minister Benjamin Netanyahu has said he will seek to dismiss the head of the internal security service this week, deepening a power struggle focused largely on who bears responsibility for the Hamas attack that sparked the war in Gaza.

Netanyahu's effort to remove Ronen Bar as director of the Shin Bet comes as the security service investigates close aides of the prime minister. Netanyahu said he has had "ongoing distrust" with Bar, and "this distrust has grown over time."

The European Union hosts a donor conference for Syria on Monday to muster support to ensure a peaceful transition after President Bashar Assad was ousted by an insurgency last December.

Ministers and representatives from Western partners, as well as Syria's regional neighbors, other Arab countries and U.N. agencies will take part in the one-day meeting in Brussels which will be chaired by EU foreign policy chief Kaja Kallas.

Yemen's Iran-backed Houthi rebels claimed responsibility on Monday for a second attack on an American aircraft carrier group in 24 hours, calling it retaliation for U.S. strikes.

A spokesperson for the group said "for the second time in 24 hours" Houthi fighters launched missiles and drones at the USS Harry S. Truman and several of its warships in the northern Red Sea.

U.S. President Donald Trump said he ordered a series of airstrikes on the Houthi-held areas in Yemen on Saturday, promising to use "overwhelming lethal force" until the Iran-backed rebels cease their attacks on shipping along a vital maritime corridor. The Houthis said at least 31 people were killed.

"Our brave Warfighters are right now carrying out aerial attacks on the terrorists' bases, leaders, and missile defenses to protect American shipping, air, and naval assets, and to restore Navigational Freedom," Trump said in a social media post. "No terrorist force will stop American commercial and naval vessels from freely sailing the Waterways of the World."

Ordnance from Syria's 13-year conflict exploded in the coastal city of Lattakia, collapsing a building and killing more than a dozen people, the Syrian Civil Defense said Sunday.

The paramedic group, known as the White Helmets, said it worked overnight, searching through debris and recovered 16 bodies, including five women and five children, and that 18 others were injured. The group and residents said the explosion occurred in a metal scrap storage space on the ground floor of the four-story building.

Iran on Sunday once again denied aiding Yemen's Houthi rebels after the United States launched a wave of airstrikes against them and President Donald Trump warned that Tehran would be held "fully accountable" for their actions.

The Houthi-run Health Ministry said the strikes killed at least 31 people, including women and children, and wounded over 100. The rebels said one strike hit two homes in northern Saada province, killing four children and a woman. The rebel-run Al-Masirah TV showed images of what it said were the bodies.

The fall of Syrian President Bashar Assad's government has aggravated already tense relations between Turkey and Israel, with their conflicting interests in Syria pushing the relationship toward a possible collision course.

Turkey, which long backed groups opposed to Assad, has emerged as a key player in Syria and is advocating for a stable and united Syria, in which a central government maintains authority over the whole country.