Two people in Saudi Arabia were killed by debris after a drone was shot down, following an attack by the Houthi militia.
Two further people were injured, the Saudi Arabian state news agency SPA reported, citing the Energy Ministry.
Air defences shot down the drone, which was targeting the Shaybah oil field run by state-owned company Aramco.
The fatalities are reported to be a Filipino and a Nepalese national, although the information could not initially be verified.
In recent weeks, the Iran-backed Houthis have ramped up attacks on neighbouring Saudi Arabia amid a renewed escalation of the war in Yemen.
Airports and oil facilities in the Gulf country have borne the brunt of the attacks, which have resulted in casualties.
Saudi Arabia supports Yemen's internationally recognized government and has repeatedly carried out airstrikes against the Houthis as part of a Saudi-led military coalition fighting the rebel group.
