A plane en route from Moscow to Chisinau made an emergency landing in Bucharest on June 14, Moldovan authorities and a pro-Russian member of parliament said.
Romanian press reports said the plane made the emergency landing because of a bomb threat.
One report said a suspicious package was found, while another said a call was placed to the emergency-response number advising that a bomb was on the aircraft.
After the emergency landing at Bucharest's international airport in Otopeni, the Romanian SRI intelligence service checked the aircraft and determined that the bomb threat had been a false alarm, Romanian media reported.
Vladimir Cebotari, founder of FlyOne, the low-cost carrier that operated the flight, also said the bomb alert was false. Cebotari told ProTV Chisinau that several people were detained.
There was a different story, however, from Moldova's Civil Aviation Authority, which said on Facebook that the airline failed to notify aviation authorities about flight schedule changes three days in advance, as required by law.
As a result, the flight did not receive the necessary approval from Moldova and was diverted.
There were more than 170 passengers on board the aircraft, most of them Moldovan citizens, according to a Moldovan media report.
Lawmaker Marina Tauber of the Shor Party said that the plane was carrying members of the Moldovan opposition political bloc Victory and that the flight originated in Moscow.
"Chisinau airport refused to allow a flight from Moscow via Yerevan carrying participants in the congress of the Moldovan opposition political bloc 'Victory' to land," she said on Telegram. "The aircraft was diverted to Bucharest."
Moldovan pro-Russian opposition parties gathered in Moscow in April to announce the formation of the Victory political bloc ahead of the presidential election and an EU membership referendum in October.
The pro-Moscow Shor Party was founded by oligarch Ilan Shor, who fled Moldova following pro-Western President Maia Sandu's election in 2020.
Moldovan authorities confirmed on May 16 that Shor had obtained Russian citizenship and identity documents. Moldovan authorities said Russia failed to officially notify Chisinau that Shor, a fugitive wanted in Moldova, had become a Russian citizen.
Shor was sentenced in Moldova to 15 years in June 2023 for his role in a $1 billion bank fraud and other illicit schemes.
Also in June 2023, the Shor Party was declared unconstitutional by Moldova's Constitutional Court and dissolved after it organized months of anti-government protests.