BAGHDAD, Iraq (CNN) -- Fifteen former Iraqi officials from the regime of executed dictator Saddam Hussein went on trial Tuesday for their alleged roles in the slaughter of thousands of Shiite Muslims during a 1991 uprising, court officials said.
They are charged with crimes against humanity in the case being heard by the Iraqi High Tribunal. Estimates of the Shiite death toll range from 20,000 to 100,000.
Four of the former regime members now standing trial have already been convicted for their roles in the Anfal campaign -- an Iraqi Army offensive in the 1980s that killed up to 100,000 people in Iraq's Kurdish region.
Mohammed Khaleefa, the chief Judge in the Anfal trial, will also preside over a five-judge panel in this case.
Those on trial, who were also convicted in the Anfal case, are:
The others on trial include:
CNN's Jomana Karadsheh and Saad Abedine contributed to this report