Six prominent wartime Bosnian Croat officials have gone on trial at the United Nations tribunal in The Hague for alleged war crimes.
Jadranko Prlic and his five co-defendants deny the charges
They all deny charges of masterminding a campaign of ethnic cleansing against Bosnian Muslims during the early 1990s.
Jadranko Prlic, the one-time president of the self-proclaimed Bosnian Croat mini-state, is the chief suspect.
Correspondents say the handling of the trial - the largest of its kind at the tribunal - will face close scrutiny.
The charges relate to 11 months in 1993-94 when Bosnian Croats and Muslims - who were allies for most of the 1992-95 war against the Bosnian Serbs - fought each other.
The indictment against the men alleges that 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.
They used "force, intimidation and terror by conducting mass arrests of Bosnian Muslims who were then either murdered, beaten, sexually assaulted, robbed of their property and otherwise abused", prosecutors allege.
The other five defendants are:
Bruno Stojic, former defence minister of the breakaway Herceg-Bosna mini-stateGeneral Slobodan Praljak, former militia headGeneral Milivoj Petkovic, former militia headValentin Coric, a former commander of Bosnian Croat military policeBerislav Pusic, in charge of prisoner exchanges
All six deny the 26 charges.
'Ethnic cleansing' on trial
The men voluntarily surrendered themselves to the tribunal's custody in 2004, as Croatia sought to advance its hopes of joining the European Union.
Because they complied with the tribunal's conditions, they were allowed to remain at liberty while waiting for their trial.
However, they will remain in custody for the duration of the trial, which could last several years, the BBC's South-East Europe analyst Gabriel Partos says.
This is the first time so many accused have been tried together so there is likely to be much more evidence presented to the court and more time spent in cross-examination, our correspondent points out.
Previous trials involving three of four accused have involved less prominent people, with charges focusing on a single incident or location.
This time, the entire project of ethnic cleansing by Bosnian Croat forces will be put on trial, our correspondent adds.