Six former Bosnian Croat officials have arrived in the Netherlands to surrender for trial on war crimes charges.
Supporters sang the national anthem as the suspects left
They are accused of murder, rape, detention and other crimes against Bosnian Muslims. They deny the charges, made public last week.
The six include Jadranko Prlic, who was prime minister of a breakaway Bosnian Croat state in 1993.
The men's surrender comes as Croatia seeks to advance its bid for membership of the European Union.
They boarded a Croatia Airlines flight from Zagreb to The Hague early on Monday, before surrendering to the tribunal after they arrived.
There were emotional scenes as they left Zagreb, where supporters gathered to sing the national anthem and some war veterans in wheelchairs wept as they saw their former leaders leave.
"I am leaving with a clear conscience," Mr Prlic said before boarding the plane. "I have no reason to prove my innocence - it is up to the court to prove my guilt."
The other five suspects are:
General Praljak said the men would clear their names.
Bruno Stojic, former defence minister of the breakaway Herceg-Bosna mini-state
General Slobodan Praljak - former militia head
General Milivoj Petkovic - former militia head
Valentin Coric, a former commander of Bosnian Croat military police
Berislav Pusic, in charge of prisoner exchanges.
"We are leaving here as innocent men and we will return as such," he said.
The indictment against the men alleges they drove Muslims and other non-Croats out of their mini-state as part of a campaign of "ethnic cleansing" to establish a Greater Croatia.
Bosnian Croats were allies with the Muslims for most of the 1992-95 war, fighting alongside each other against the Bosnian Serbs.
But for 11 months in 1993-94 they fought each other in a bitter conflict which saw murder, rape and other war crimes committed.
At the peak of the conflict, Bosnian Croats rounded up
hundreds of Muslim men and put them in detention camps.
Croatian general Ante Gotovina, indicted by the tribunal in 2001, remains at large.