Saudi Arabia’s shares fell in early trading on Sunday, the first reaction of the market to drone attacks on the vital east-to-west pipeline.

Saudi Arabia’s main stock index dropped 1%. Shares of Al Rajhi Bank fell 0.8% and shares of Saudi Arabian Mining Company fell 2.4%.

Shares of Aramco fell 1.1%, while Rabigh Refining and Petrochemical Company recorded the worst performance of the session with a drop of 7.3%.

Saudi Arabia closed the pipeline on Thursday as a precaution following the drone attack from Iraqi territory on areas in Riyadh and Medina.