A week after a drone attack on Aramco’s refiners, no clear link has been established to Iran. Investigators have not given up though. The WSJ has reported that both Saudi and U.S. intelligence agencies are actively searching for the “smoking gun” which they believe will be revealed in the remains of the GPS unit. According to the WSJ;

The GPS systems could allow investigators to trace the drones and missiles back to their runways and launchers, which Saudi and American officials believe were in Iran. Inspectors from around the world — including the U.S., France and the United Nations — are scrutinizing pieces of the weapons from the attacks, which temporarily knocked out half of Saudi oil production and rattled the global economy.

Source: WSJ/ZeroHedge