• The attack involved both cruise missiles and drones.
  • The attack involved a higher degree of complexity and sophistication than initially thought.

WASHINGTON: The United States believes Saturday's attack on Saudi Arabia's oil facilities originated in southwestern Iran, a US official told Reuters on Tuesday.

Three officials, speaking to Reuters on condition of anonymity, said the attack involved both cruise missiles and drones, indicating the attack involved a higher degree of complexity and sophistication than initially thought.