Another photo on the wall

For more than a decade, the Kasba family has displayed a banner depicting brothers Samer and Yasser, shot dead by Israeli troops during the second Palestinian intifada aged 15 and 11.

Ten days ago, Fatima and Sami Kasba added the picture of a new "martyr" -- 17-year-old Mohammed, their third son to die by Israeli army gunfire.

The incident that led to his death has sparked controversy in Israel and anger among Palestinians, with video footage made public challenging the army's initial version of events.

An officer shot Kasba dead on July 3 after he threw stones at an army vehicle close to the Qalandia checkpoint in the occupied West Bank, on the third Friday of the Muslim holy month of Ramadan.

The army, which has opened an investigation, said after the shooting that Kasba posed an "imminent danger" to soldiers.

But Israeli rights group B'Tselem challenged the military's version, drawing on CCTV footage, witness testimony and forensic evidence to conclude that he was shot in the back at close range after throwing a stone then running away from troops.

Colonel Israel Shomer shot Kasba twice in the back and once in the side of the face, B'Tselem said, calling the killing "unjustified and unlawful".

Colonel Shomer quickly received the support of senior Israeli army officials and the approval of cabinet ministers, who said he acted proportionally and in self-defence.

There are conflicting accounts, but for the family the result is still the same -- a third dead son.

"Every day there is a martyr, not just in our family, but for all Palestinian families," Sami Kasba said.

"Someone is hurt, someone is killed, someone is arrested. This is what happens, that's the occupation," he told AFP, recalling the moment he found out his son had been shot.