clipped from: news.bbc.co.uk 
The four-member team entered from Egypt after Israel failed to grant visas, despite repeated requests by the UN.
The UN wants to investigate whether Israel and Hamas committed war crimes during Israel's three-week operation in Gaza in December and January.
The UN Human Rights Council has been accused of singling out Israel unfairly, and is viewed by some as having less credibility than other parts of the United Nations.
"They have been instructed to prove that Israel is guilty and we will not collaborate with such a masquerade," foreign ministry spokesman Yigal Palmor told AP news agency.
Several investigations into alleged violations of international law during Israel's 22-day operation in Gaza, which ended on 18 January, have now reported back.
