TEL AVIV, Israel (AP) — Associated Press reporting into an Israeli attack on a Gaza Strip hospital that killed 22 people, including five journalists, raises serious questions about Israel’s rationale for the strikes and the way they were carried out. Among those killed was Mariam Dagga, who worked for AP and other news organizations.

Israeli forces struck a position well known as a journalists’ gathering point, because — a military official said — they believed a camera on the roof was being used by Hamas to observe troops. The official cited “suspicious behavior” and unspecified intelligence, but the only detail given was that there was a towel on the camera and the person with it — which the army interpreted as an effort to avoid identification.

AP has gathered new evidence indicating the camera in question actually belonged to a Reuters video journalist who routinely covered his equipment with a white cloth to protect it from the scorching sun and dust. The journalist, Hussam al-Masri, was killed in the initial strike.

The evidence calls into question why Israeli forces went through with the strike. Witnesses say Israel frequently observed the position by drone, including about 40 minutes before the attack, giving an opportunity to correctly identify al-Masri.

AP’s findings also reveal other troubling decisions from the Aug. 25 attack:

— Soon after the first strike, Israeli forces hit the same position again, after medical and emergency workers had reached the scene to treat the injured, and as journalists including Dagga had rushed to cover the news. The strike has raised accusations of a “double tap” — a type of attack intended to kill those responding to casualties and which experts in international law say is a possible war crime.

— Troops used high-explosive tank shells to strike a hospital, instead of more precise guided weapons that might have resulted in fewer casualties.

— In all, Israel struck the hospital four times, the AP found, each time without warning.