The mobile video, originally shared by the New York Times, shows the vehicles pulling up on the road when, without warning, shooting begins just before dawn.
The footage continues for more than five minutes, with the paramedic, named as Refat Radwan, heard saying his last prayers before the voices of Israeli soldiers are heard approaching the vehicles.
An IDF official briefed journalists on Saturday evening, saying the soldiers had earlier fired on a car containing three Hamas members.
When the ambulances responded and approached the area, aerial surveillance monitors informed the soldiers on the ground of the convoy “advancing suspiciously”.
When the ambulances stopped beside the Hamas car, the soldiers assumed they were under threat and opened fire, despite no evidence any of the emergency team was armed.
Israel has admitted its earlier account claiming the vehicles approached without lights was inaccurate, attributing the report to the troops involved.
The video footage shows the vehicles were clearly marked and the paramedics wore reflective hi-vis uniform.
The soldiers buried the bodies of the 15 dead workers in sand to protect them from wild animals, the official said, claiming the vehicles were moved and buried the following day to clear the road.
They were not uncovered until a week after the incident because international agencies, including the UN, could not organise safe passage to the area or locate the spot.
When an aid team found the bodies they also discovered Refat Radwan’s mobile phone containing footage of the incident.
The Israeli military official denied any of the medics were handcuffed before they died and said they were not executed at close range, as some reports had suggested.
Earlier this week, a surviving paramedic told the ambulances had their lights on and denied his colleagues were linked with any militant group.
The IDF promised a “thorough examination” of the incident, saying it would “understand the sequence of events and the handling of the situation”.
The Red Crescent and many other international organisations are calling for an independent investigation.
Israel renewed its aerial bombardment and ground offensive in Gaza on 18 March after the first phase of a ceasefire deal came to an end and negotiations on a second phase stalled.
More than 1,200 people have since been killed in Gaza since then, according to the territory’s Hamas-run health ministry.
The Israeli military launched a campaign to destroy Hamas in response to an unprecedented cross-border attack on 7 October 2023, in which about 1,200 people were killed and 251 were taken hostage.
More than 50,600 people have been killed in Gaza since then, according to the territory’s health ministry.
