An Austrian Airlines flight from Tel Aviv to Vienna was forced to divert to Sofia, Bulgaria, on Sunday night after a reported bomb threat, the BBC and Euronews reported.

The Airbus A320 made an emergency landing in Sofia, where passengers were evacuated, the BBC reported, citing a statement from Bulgaria's transport ministry. The Bulgarian air force scrambled a MiG-29 fighter jet to escort the airliner, the BBC and Euronews reported.

The plane was over Romania when it diverted, and it landed about 30 minutes after the alert was first raised, the BBC reported. Euronews reported that the crew sent the general emergency code 7700 and that the airline set up a crisis team.

There were 51 passengers and six crew members on board, an Austrian Airlines spokesperson said, according to the BBC. Euronews reported the same figures, citing the news agency AFP.

Austrian Airlines confirmed a threat had been made but gave no further details, the BBC reported. Authorities searched the plane after it landed, the BBC reported. The airline said no threat was found and the flight finished its journey to Vienna with all passengers on board, the BBC reported. No injuries were reported, and an investigation has begun, the BBC reported.

Flight tracking data showed Austrian Airlines flight 82 left Ben Gurion Airport on Sunday evening and landed at Sofia's Vasil Levski airport about three hours later, the BBC reported.

Last month, a pilot tried to hijack a Flydubai flight bound for Tel Aviv by attacking the captain before crew and passengers overpowered him, the BBC reported.

What we know: The flight landed safely in Sofia after a bomb threat, no threat was found and the plane continued to Vienna.
What we don't: Who made the threat and how it was delivered have not been disclosed.