"Our government, and the Americans even more so, should hang their heads in shame at their one-sided approach and the failure to condemn the immoral situation that the rest of the world is condemning," Kilfoyle said.
"It's disgraceful criminal activity by the Israeli state," he said. "It's a senseless slaughter of civilians and, in terms of Hamas against the Israeli defense force, like a peashooter against an elephant," the Islamic republic news agency quoted him as saying.
The former Labor defense minister is among 100 backbench MPs pressing the British government to openly condemn Israel for deliberately targeting innocent civilians in Gaza.
The MPs, which also include three former cabinet ministers, Frank Dobson, Claire Short and Andrew Smith, have signed a statement describing the Israeli military attacks as an "outrage that the international community must not allow to continue".
The statement, circulated by Labor MP Richard Burden, also agrees with Israeli human right groups that the targets in Gaza "include also clearly civilian installations" and calls for an embargo on UK arms sales to Israel.