(FILES) A general view shows Ras Tannura's oil production plant near Dammam in Saudi Arabia's eastern province. AFP
The source said the attack caused a fire at the Ras Tanura refinery but the blaze had already been extinguished.
A Saudi defence ministry spokesman said two drones had targeted the refinery and been intercepted, according to a statement posted by the Saudi Press Agency on X.
The Ras Tanura complex along the kingdom's eastern Gulf coast is home to one of the largest refineries in the entire Middle East and a cornerstone to the kingdom's energy sector.
The facility has a capacity of 550,000 barrels per day.
The complex also serves as one of the world's biggest oil ports.
Saudi oil infrastructure has been targeted in the past by Iranian-backed Houthi rebels.
In March 2022, the Houthis launched a drone attack targeting the YASREF refinery in Yanbu Industrial City on the Red Sea.
And in 2019, Houthi-claimed aerial assaults on two Aramco facilities in eastern Saudi Arabia temporarily knocked out half of the kingdom's crude production.
Short link: