Human Rights Watch in a report on Thursday has said that Israel has caused massive forced displacement of Palestinians in Gaza to the extent that it constitutes war crime and crime against humanity, news organisations have reported.

"Human Rights Watch found that forced displacement has been widespread, and the evidence shows it has been systematic and part of a state policy. Such acts also constitute crimes against humanity," media reports said quoting the Human Rights Watch report.

Human Rights Watch investigates and reports on abuses happening in all corners of the world. The organisation constitutes of about 550 people of 70-plus nationalities who are country experts, lawyers, journalists, and others who work to protect the most at risk, from vulnerable minorities and civilians in wartime, to refugees and children in need.

Israel invaded the Gaza Strip last year after Hamas-led gunmen attacked communities in southern Israel, killing around 1,200 people, according to Israeli authorities, and abducting more than 250 as hostages. In the last one year, about 43,000 Palestinians have been killed and hundreds of thousands have been rendered homeless, left hungry to die on the roads.