Iraq has confirmed that drones used in an attack on Saudi Arabia’s strategic East-West oil pipeline were launched from Iraqi territory, prompting Baghdad to take security measures as it investigates those responsible.

Saudi Arabia temporarily shut down the pipeline as a precaution following the attack, which caused injuries and damage to infrastructure. Riyadh said it would hold off on an immediate response after the Iraqi government requested time to investigate and prevent further attacks originating from its territory.

Iraqi authorities traced the launch area to Maysan province, which borders Iran and has long been associated with the presence of Iran-backed Shiite armed groups. The Iraqi government subsequently dismissed senior security officials in the province and launched an investigation into the incident.

Authorities also temporarily closed border crossings with Iran as part of efforts to identify those responsible and prevent their escape.

No group has claimed responsibility for the drone attack.

The Popular Mobilization Forces, an umbrella organization that includes several Iran-aligned Iraqi militias and is formally incorporated into Iraq’s security apparatus, denied involvement. Some armed groups within the broader network have operated with varying degrees of independence from Baghdad.

U.S. President Donald Trump said Saturday that Iran was “probably” responsible for the attack. Neither Iraq nor Saudi Arabia, however, has publicly identified the specific group responsible.

The attack has heightened concerns over regional energy security because Saudi Arabia’s East-West pipeline provides an important alternative route for transporting crude oil from the kingdom’s eastern production areas to the Red Sea, bypassing the Strait of Hormuz.