Microsoft Solutions Consultant Sam Mitrovic issued a security alert after nearly falling victim to what was described as a “hyper-realistic AI scam call” capable of fooling even the most experienced users, Forbes reports.

The story began, according to the report, a week before Mitrovic realized the sophistication of the attack targeting him. He wrote a blog post warning Gmail users of the threat that began with the message, “I received a notification that my Gmail account was approved to be restored.”