”Bomb terrorism” emails sent to 100 locations including Incheon Airport... No explosives found = South Korea

A "bomb terrorism teaser" email was sent to over 100 locations across South Korea, including public institutions, companies, and religious organizations, including Incheon International Airport, and police began searches, but no explosives were found.
According to the National Police Agency and other sources, on the 14th, an email in English stating, "Explosives have been placed in a building. The explosives will be detonated in the morning," was sent to the Incheon Airport Lost and Found Center at around 9 a.m. on the same day.
The email was sent to 100 institutions nationwide, including Busan University, Busan National University Hospital, and other institutions. The police, who received the first report from Incheon Airport, passed on the relevant information to government offices nationwide and reported the email.
A search was launched at Busan University, Busan University Hospital, and other institutions. However, no explosives have been found to date. The Incheon Metropolitan Police Agency's Cyber Investigation Team believes that the explosion terrorism claim is likely false.
The sender of the email is currently being tracked using Internet Protocol (IP) tracking and other methods. These types of emails have been sent from India in January and May of this year.
A police official said, "We have learned that the email was sent through Google's Gmail, and we plan to request international assistance in the investigation."