TUNIS, Tunisia, June 6 (UPI) -- Opposition authorities in Libya should either provide full due process to civilian detainees or let them go free, Human Rights Watch said.
Human Rights Watch maintains that at least 330 civilians and combatants were in the custody of opposition authorities in Libya.
Sarah Leah Whitson, Middle East and North Africa director at Human Rights Watch, said there was "no excuse" for delays of justice in parts of Libya under rebel control.
"The authorities should rein in volunteer security groups, establish a clear civilian authority for criminal justice and make sure detainees get full due process rights," she said in a statement.
Detentions, the watchdog group said, should be made only by civilian authorities with concrete evidence of a crime in hand.
International forces are enforcing a U.N.-mandated no-fly zone over Libya. U.N. Security Council Resolution 1973 authorized military force to protect civilians from attacks by forces loyal to Libyan leader Moammar Gadhafi.
The International Criminal Court said it has evidence to link Gadhafi to war crimes in Libya.