Syrian President Bashar Assad tops a list of 20 sample war crimes indictments of government officials and rebels drafted by experts for prosecution someday, a former international war crimes prosecutor said Tuesday.

The list has been handed to the International Criminal Court, citing for each incident a specific violation of the Rome statute under which a suspect could be charged, said David Crane, an ex-chief prosecutor of the Special Court for Sierra Leone and now head of the Syria Accountability Project.

A separate team of U.N. investigators has drawn up four confidential lists of war crimes suspects from all sides in Syria's civil war, but declined to reveal names.