Ahmed Samir Assem, a 26-year-old photojournalist, was working for an Egyptian newspaper when he was killed on Monday along with at least 51 others.

He was taking pictures of the Republican Guard building in Cairo, where ousted president Mohamed Morsi is believed to be being held.

In the grainy footage, the sniper can clearly be seen shooting at targets, before pointing the gun directly at the camera.

His colleagues at the Al-Horia Wa Al-Adala newspaper said news of his death filtered through when Assem's bloodied camera and mobile phone were found at the scene.

The culture editor of Assem’s newspaper Ahmed Abu Zeid, told The Telegraph: "I received news that Ahmed had been shot by a sniper in the forehead while filming or taking pictures on top of the buildings around the incident.

"Ahmed’s camera was the only one which filmed the entire incident from the first moment.

"He had started filming from the beginning of the prayers so he captured the very beginnings and in the video, you can see tens of victims. Ahmed’s camera will remain a piece of evidence in the violations that have been committed".

Since last week, Egypt has been the scene of rival rallies and clashes between thousands of supporters and opponents of the ousted president.

Morsi was unseated by the military on July 3, and the Chief Justice of Egypt’s Supreme Constitutional Court, Adly Mansour, was sworn in as interim president of Egypt on July 4.

The Brotherhood censured the ouster of Mohamed Morsi as a "Military Coup".

SHI/SHI