Tehran, March 31 -- Iran's Islamic Revolution Guards Corps (IRGC) has issued a chilling ultimatum to 18 major American corporations, warning that their regional infrastructure will be targeted following allegations of their involvement in hostile operations.

According to a report by Iranian state media Press TV, the elite military force claimed these businesses have actively "assisted US-Israeli terror operations inside Iran by providing espionage services."

The IRGC issued a formal statement on Tuesday, declaring that these firms should prepare for retaliatory strikes. The military body specified that the planned "reprisal attacks starting at 20:00 Iran time on April 1" would be devastating.

It warned that the companies' regional "off...