“We'll take all measures, including those we will not disclose publicly, which we ourselves consider proportionate and necessary to deter any further attacks and punish those responsible for this unacceptable aggression,” he said.

Iran’s ambassador to France has been summoned to the foreign ministry after French prosecutors said that they were opening an investigation into the hacks.

According to French investigators, Iran’s cyber unit linked to the IRGC, Shahid Kaveh, carried out the destructive attacks.

The French investigation will focus on the unit’s head, the Paris prosecutor’s office said in a statement, adding that about 20 fires had been started because of the cyberattack.

“The attackers took remote control of the equipment via web interfaces to trigger abnormal defrost cycles of unlimited duration, while disabling the security alerts on the sensors that were supposed to activate once a certain temperature was exceeded,” it added.

On Monday, European Council President Kaja Kallas said that the topic of alleged Iranian hacks would be discussed at next week’s European foreign affairs council. If the attribution is confirmed, she said, “[Europe’s] response should be strong.”

The European Commission is also looking into these cyberattacks, which European Agriculture and Food Commissioner Christophe Hansen described as a “deliberate attempt to disrupt our food supply chain.”