Residents in Saudi Arabia’s capital reported new explosions on Wednesday as the Saudi-led military coalition said it had intercepted a ballistic missile fired towards Riyadh amid escalating attacks by Iran-backed Houthi rebels.

The Houthis claimed attacks on King Khalid International Airport, oil facilities in Dhahran and an Aramco refinery in Riyadh, describing them as retaliation for Saudi strikes on rebel-held areas of Yemen.

There were no immediate reports of casualties or damage from the latest explosions. Saudi civil defence authorities issued air raid alerts for Riyadh and Kharj province.

The escalation has raised concerns over Saudi Arabia’s ability to intercept the rebels’ missiles and drones. Regional officials say the kingdom, the world’s largest purchaser of American weapons, is running low on missile interceptors.

Saudi Civil Defense said debris from two intercepted Houthi ballistic missiles fell on residential areas in Riyadh overnight, injuring four people, including a child, and damaging 15 homes.

Meanwhile, Yemen’s Houthi-run Health Ministry said two people were killed and two others injured in a Saudi airstrike on a state oil company facility in the Ras Isa port area of Hodeida province on Tuesday. It also reported an attack on an oil facility in Sanaa.

Saudi Arabia has intensified airstrikes against rebel-held areas in support of Yemen’s internationally recognised government, while the Houthis continue targeting critical Saudi infrastructure.

The fighting has raised questions about possible US intervention. President Donald Trump has said he is evaluating whether Washington should join the Saudi-led strikes against the Houthis.

Ahmed Nagi, senior Yemen analyst at the International Crisis Group, said attacks on fuel storage facilities in Houthi-controlled areas marked a new phase in the Saudi-led campaign, warning that a prolonged war of attrition could weaken the rebels’ military capabilities.