Former Deputy Prime Minister John Prescott has compared Gaza to a concentration camp and said Israel's "brutally disproportionate and grossly indiscriminate" bombardment must be regarded as a war crime.
Writing in the Sunday Mirror, Lord Prescott said any other country would be made an international "pariah" if it acted in the same way, as the reported death toll from the offensive reached more than 1,000.
Prescott wrote: "The military action supposedly targeting Hamas is so brutally disproportionate and so grossly indiscriminate that it makes it impossible not to view Israel's actions as war crimes."
He added: "Israel brands them terrorists but it is acting as judge, jury and executioner in the concentration camp that is Gaza.
"What happened to the Jewish people at the hands of the Nazis is appalling. But you would think those atrocities would give Israelis a unique sense of perspective and empathy with the victims of a ghetto."