"However, only a ruling by an international tribunal in that sense would make such an assessment truly authoritative," it added.

The report said the "strategic fragmentation of the Palestinian people" was the main method through which Israel imposes apartheid, with Palestinians divided into four groups oppressed through "distinct laws, policies and practices."

It identified the four sets of Palestinians as: Palestinian citizens of Israel; Palestinians in East Jerusalem; Palestinians in the West Bank and Gaza Strip; and Palestinians living as refugees or in exile.

ESCWA hoped the report would inform further deliberations on the root causes of the problem in the United Nations, among member states, and in society, Khalaf said at an event to launch the report at ESCWA's Beirut headquarters.

It was authored by Richard Falk, a former U.N. human rights investigator for the Palestinian territories, and Virginia Tilley, professor of political science at Southern Illinois University.

Before leaving his post as U.N. special rapporteur on human rights in the Palestinian territories in 2014, Falk said Israeli policies bore unacceptable characteristics of colonialism, apartheid and ethnic cleansing.

The United States accused him of being biased against Israel.