In a speech to the United National Security Council, Luis Moreno-Ocampo said: “There are allegations of crimes committed by Nato forces, allegations of crimes committed by NTC-related forces… as well as allegations of additional crimes committed by pro-Gaddafi forces.
“These allegations will be examined impartially and independently by the (prosecution),” he said.
Mr Moreno-Ocampo also said he was investigating whether the former Libyan leader and his spy chief ordered mass rapes as they battled an insurgency earlier this year. Gaddafi died shortly after his capture last month by the former rebels, now government forces.
Human rights groups have said that NTC forces singled out sub-Saharan African migrant workers for arbitrary arrest and detention on the assumption that they supported Gaddafi.
Channel 4 News Chief Correspondent Alex Thomson said he had witnessed apparent attacks on migrant workers by rebel fighters.
Libya’s interim leadership has said it would like to try Saif al-Islam and former intelligence chief Abdullah al-Senussi in Libya. Both men have been indicted by the ICC for crimes against humanity and other war crimes.