Al Jazeera reported the incident, citing the Bulgarian Ministry of Transport.
According to the report, the crew received a bomb threat warning on Sunday (October 18) as the aircraft approached the Romanian border. Consequently, the decision was made to divert and land the flight in the Bulgarian capital, Sofia.
To control the situation, a Bulgarian Air Force MiG-29 fighter jet escorted the aircraft through the air and guided it to Sofia Airport.
Transport ministry data indicated that the aircraft was carrying 53 passengers and 6 crew members, all of whom were safely evacuated from the plane. Airline authorities told AFP that a thorough security search of the aircraft was conducted.
Once the search concludes, arrangements will be made to transport the passengers to their destination via an alternative flight as quickly as possible..
The Bulgarian Ministry of Transport has formed a high-level crisis management team to investigate the incident, and relevant authorities have initiated their probe.
Data from flight tracking website FlightAware showed that Sunday's flight departed from Tel Aviv's Ben Gurion Airport at 6:46 PM local time and landed at Sofia's Vasil Levski Airport roughly three hours later.
Data from Flightradar24 indicated that around 9:15 PM, shortly after entering Romanian airspace, the aircraft abruptly turned south and headed back toward Bulgaria.
Additionally, data from another tracking platform showed that the aircraft began transmitting a special "squawk code 7702" to signal an in-flight emergency.