In a damning report released today, Amnesty International said Palestinian rocket fire during the 2014 summer war in Gaza had killed more civilians inside the Gaza Strip than inside Israel.
Such deadly attacks on civilians were against international law and constituted "a war crime," it said.
It urged Palestinian armed groups to end all direct attacks on Israeli civilians and ensure everything was done to also protect Palestinian civilians inside Gaza from the effects of those attacks.
The 50-day war claimed the lives of some 2,200 people in Gaza, most of them civilians, and 73 on the Israeli side, most of them soldiers.
The report said rocket attacks had killed six civilians inside Israel, including a child, but that other rockets aimed at the Jewish state had fallen short inside Gaza, killing at least 13 civilians, 11 of them children.
It referred to one particular incident on July 28 in which 13 people were killed in deadly blast inside the beachside Shati refugee camp in Gaza City.
At the time, Palestinian witnesses blamed the attack on an Israeli F-16 warplane, but the army denied firing on the camp, accusing militants of misfiring their own rockets.
"In the deadliest incident believed to have been caused by a Palestinian armed group during the conflict, 13 Palestinian civilians -- 11 of them children -- were killed when a projectile exploded next to a supermarket in the crowded al-Shati refugee camp," the report said.
Contrary to Palestinian claims that Israel was responsible, "an independent munitions expert who examined the available evidence on behalf of Amnesty International concluded that the projectile used in the attack was a Palestinian rocket," it said.
Figures released by the Israeli army just days after the war ended on August 26 showed that Gaza militants fired 4,591 projectiles at Israel.
Of that number, 3,659 struck Israeli territory and 735 were intercepted by the Iron Dome air defence system, leaving another 197 which fell short and landed inside the coastal enclave.
Militant groups used unguided projectiles which were "inherently indiscriminate," it said: "Using such weapons is prohibited under international law and their use constitutes a war crime."
"In launching these attacks, they displayed a flagrant disregard for international humanitarian law and for the consequences of their violations on civilians in both Israel and the Gaza Strip," said Philip Luther, director of the Middle East and North Africa programme at Amnesty International.
