Spanish Prime Minister Pedro Sánchez announced that the government has set up a commission of inquiry, and the Supreme Court also announced the launch of an investigation to determine the cause of the blackout that caused chaos across the Iberian Peninsula yesterday.

“All necessary measures will be taken to ensure that this does not happen again,” Sanchez said at a press conference, noting that he would hold “private operators in the electricity sector “accountable.

The commission of inquiry will be led by the Ministry of Ecological Transition, the prime minister said.

Sanchez ruled out the possibility that excess electricity generated from renewable sources caused the blackout.

He said technicians are still trying to find the exact cause of the grid collapse, and the results of their investigations will be used to strengthen the system.

REE, the operator of Spain’s electricity grid, said shortly earlier today that based on a preliminary assessment, it had ruled out the possibility of a cyber attack, assuring that “no infiltration” of control systems had been detected. The Portuguese government also ruled out the possibility of a cyber attack.

However, Sanchez said Spanish cybersecurity authorities were conducting a separate investigation into the possibility of a cyberattack.

Meanwhile, Spain’s Supreme Court announced today that it will launch its investigation into the blackout to determine whether a cyberattack against Spanish critical infrastructure may have caused the massive disruption of electricity.

If it turns out to be a cyberattack, Judge Jorge Calama will investigate the case as a crime of terrorism, according to a court document.