The International Criminal Court claims the Libyan government planned to kill civilians to crush protests even before the uprising began, BBC News reports.
Chief prosecutor Luis Moreno-Ocampo is expected to request arrest warrants for Libyan leader Muammar al-Qaddafi, his sons and his aides.
"We have evidence that after the Tunisia and Egypt conflicts in January, people in the regime were planning how to control demonstrations inside Libya. The planning at the beginning was to use tear gas and (if that failed to work)... shooting," Moreno-Ocampo told Reuters.
The ICC also wants to speak with defected Libyan minister Moussa Koussa about attacks on civilians.
"The fact is that when we warned different people, including Moussa Koussa, that the troops were committing crimes, if someone cannot control them, defecting is a valid option and that is what Moussa Koussa did. We will see what responsibility he had," Moreno-Ocampo told Reuters.