There have been widespread reports of a civilian massacre following a Sunday Israeli air strike on a camp for displaced Palestinians in the besieged southern city of Rafah, which the Gaza Health Ministry says killed 45 people, including women and children.

Israel says it is investigating the strike, amid widespread international condemnation and as horrific videos of the attack aftermath circulate widely, with Israel's top military prosecutor calling the attack "very grave".

Major-General Yifat Tomer Yerushalmi said in a briefing the Israeli army "regrets any harm to non-combatants during the war" and that "The details of the incident are still under an investigation, which we are committed to conducting to the fullest extent."

Fire rages after the airstrike, via Al Jazeera