Gaza (Quds News Network)- A new investigation has found that the camera the Israeli military claimed was used by Hamas, to justify a strike on Nasser Hospital in southern Gaza last month, actually belonged to Reuters video journalist Hussam al-Masri, who was killed in the attack along with 21 others, including four journalists and several rescue workers. Last month, Israeli forces struck the hospital, a position well known as a journalists' gathering point, claiming a camera on the roof was being used by Hamas to observe forces. The only detail given was that there was a towel on the camera. Al-Masri routinely covered his equipment with a white cloth to protect it from the scorching sun and dust, and witnesses said Israel frequently observed the position by drone, including about 40 minutes before the attack, giving an opportunity to correctly identify al-Masri, according to the investigation by the Associated Press. In the weeks before the strikes, al-Masri had broadcast live almost daily from the hospital's stairwell. Photographers and videographers used the building's external staircase for months to get a bird's-eye view of the city of Khan Younis. The AP had repeatedly informed the military that its journalists were stationed there. It is common practice for video journalists around the world, including in Gaza, to use such high positions and to cover their cameras to protect them from the elements. Five journalists told the AP that he often used the cloth. Shortly after the first attack on the staircase, the investigation found that the forces shelled the area again, as medical teams and additional journalists arrived at the scene. The attack appears to have used high-explosive shells, rather than more precise weapons that might have reduced the number of casualties.