United Nation ? A U.N. investigation concluded Tuesday that both sides in the Israeli-Palestinian conflict in Gaza committed war crimes and possible crimes against humanity, raising the prospect that officials may seek prosecution in the International Criminal Court.

The probe led by former South African judge Richard Goldstone concluded that “Israel committed actions amounting to war crimes, possibly crimes against humanity,” during its Dec. 27-Jan. 18 military operations against Palestinian rocket squads in the Gaza Strip.

In a 575-page report, Goldstone and three other investigators also found evidence “that Palestinian armed groups committed war crimes, as well as possibly crimes against humanity.”

Goldstone said the probe, which included interviews as well as a review of documents, photos and 30 videos, was completed Tuesday morning, just hours before the hastily called news conference.

“There should be no impunity for international crimes that are committed,” said Goldstone, a veteran war crimes investigator who has served as chief prosecutor for the U.N. criminal tribunals for the former Yugoslavia and Rwanda.

“It’s very important that justice should be done.”