An Australian and a Canadian, both of Lebanese origin, will be tried in absentia on charges of being accomplices in a bombing that killed five Israeli tourists at a Bulgarian airport in 2012, prosecutors say.
Australian Meliad Farah and Canadian Hassan El Hajj Hassan have both been charged with terrorism, prosecutors said - the first suspects to be indicted in the four years since the attack.
The Israeli tourists had arrived in the Black Sea city of Burgas on a charter flight and were in the bus in the airport car park when the blast tore through the vehicle, also killing the Bulgarian driver and wounding more than 30 people.
Bulgarian authorities blamed Lebanese Shi'ite Muslim militant group Hezbollah for the attack, an accusation dismissed by Hezbollah.
"The indictment has been filed with the Specialised Criminal Court. The two men, for whom a red notice has been issued by Interpol, are charged with terrorism," the spokeswoman for the prosecutors' office, Rumiana Arnaudova, said.
The trial will be held in absentia as the whereabouts of Farah, 35 and Hassan, 28, remain unknown, she added.
In 2013, a senior Bulgarian official said they were believed to be in Lebanon.
Bulgarian authorities have identified the bomber as Mohamad Hassan El Husseini, a dual Lebanese-French citizen who they said was killed in the attack.