The graphic footage appears to show a Palestinian man being shot dead by snipers as he lies on the ground in Gaza International Solidarity Movement

Footage has emerged appearing to show a unarmed Palestinian man who was looking for members of his family during a humanitarian ceasefire in the devastated Shejaiya district of Gaza being shot dead having first been wounded by suspected Israeli forces. Shooting a wounded civilian is deemed a war crime, though the identity of the sniper has not been confirmed.

We all just watched a man murdered in front of us
- Joe Catron (ISM)

In the harrowing footage, published to YouTube by the International Solidarity Movement (ISM), the man - wearing a green top and blue jeans - calls out to his family fearing they may be trapped in the area, scene of some of the bloodiest carnage since Israel began "Operation Protective Edge" two weeks ago.

Havign been wounded by the first shot, the man waits for rescuers to reach him but is then shot dead International Solidarity Movement

US International Solidarity Movement (ISM) activist Joe Catron said: "We all just watched a man murdered in front of us. He was trying to reach his family in Shujaiya, he had not heard from them and was worried about them. They shot him, and then continued to fire as he was on the ground. We had no choice but to retreat. We couldn't reach him due to the artillery fire and then he stopped moving."

Since the beginning of Israel's operation to destroy the Hamas organisation in Gaza at least 550 Palestinians have died, including at least 60 in Shejaiya district on 20 July, when the video footage was said to be filmed. UN Secretary General Ban Ki-moon called Sunday's operation in Shejaiya "an atrocious action".

Today Al-Aqsa hospital in central Gaza was bombed by Israel, killing at least five and leaving more than 70 injured. Many of the casualties are said to be doctors. The Israeli defence Force (IDF) claims anti-tank missiles were kept in the area. "Civilian casualties are a tragic inevitability of [Hamas'] brutal and systematic exploitation of homes, hospitals and mosques in Gaza," said the IDF.

Many in Israel are uncomfortable at footage of Gaza is beamed round the world, but some in the country believe now is the time to wipe out Hamas once and for all. However as more and more shocking footage and images appear, and as many civilians including children are killed or maimed, the pressure is growing on politicians to end the fighting as soon as possible.