“Israel must break with its recent lamentable track record in holding wrongdoers accountable, not only as a means to secure justice for victims but also to ensure the necessary guarantees for non-repetition,” the report continued.
“With regard to Palestinian armed groups, the commission has serious concerns with regard to the inherently indiscriminate nature of most of the projectiles directed towards Israel by these groups and to the targeting of civilians, which violate international humanitarian law and may amount to a war crime,” it added.
The investigators also condemned Palestinian armed groups for executing those suspected of collaborating with Israel.
The commission, composed of chair Davis and Senegalese lawyer and human rights expert Doudou Diene, was launched a year ago at the request of the Palestinians.
“We must remember that the victims are not just numbers ... they are individual people,” Davis said as she released the report in Geneva.
A cease-fire last August ended the fighting between Gaza fighters and Israel.
The United Nations has previously said that most of the 2,139 Palestinians killed in the conflict were civilians, while 66 Israeli soldiers, six Israeli civilians and one Thai national were also killed.