U.S.-made munitions were used in the deadly Israeli raid on a displacement camp in Rafah on Sunday, a CNN analysis of video from the scene and a review by explosive weapons experts has found.

At least 45 people were killed and more than 200 injured after a fire broke out following an Israeli military raid on the outskirts of Gaza's southernmost city, most of them women and children, according to the Gaza Ministry of Health and Palestinian medics.

Footage obtained by CNN showed large areas of the camp in Rafah engulfed in flames, as dozens of men, women and children frantically tried to find cover from the night attack. Burnt bodies, including those of children, were seen as rescuers pulled them from the rubble.

The escalating Israeli assault on Rafah - where some 1.3 million Palestinians were sheltering before Israel began its operation there - has drawn swift international condemnation, with UN agencies, aid groups and multiple governments calling on Israel to immediately halt its offensive.

Israeli tanks were seen advancing further into Rafah on Tuesday for the first time in Israel's seven-month-long war against Hamas, signaling a new phase in its controversial and devastating offensive.

However, US President Joe Biden is not changing his policy towards Israel, suggesting that the deadly strike in Rafah has not yet crossed the red line that would force changes in US support, although he said in an interview with CNN at the time Earlier this month he would not allow some certainty. American weapons will be used in a major attack on Rafah.

CNN has geolocated videos showing tents engulfed in flames following the raid on an internally displaced persons camp known as "Kuwait Peace Camp 1."

In a video shared on social media, which CNN geolocated to the same scene by matching details including the camp entrance sign and tiles on the ground, the tail of a US-made GBU-39 small diameter bomb (SDB) is visible, according to Four explosive weapons experts reviewed the video for CNN.

Explosive weapons expert Chris Cobb Smith told CNN on Tuesday that the GBU-39 bomb, manufactured by Boeing, is a high-precision munition "designed to attack targets of strategic importance" and produces low collateral damage. However, Cobb Smith, also a former British Army artillery officer, said: “The use of any ammunition, even of this size, will always present risks in a densely populated area.”

Trevor Ball, a former senior member of the US Army's explosive ordnance disposal team who also identified the fragment as being from a GBU-39 bomb, explained to CNN how he arrived at his conclusion.

“The warhead portion [of the munition] is distinct, and the steering and wing section are very unique compared to other munitions. The steering and wing portions of munitions are often the remains left behind even after the munition explodes. I saw the rear operating section and immediately knew it was an SDB/GBU-39 variant.”

Paul also concluded that although there was a variant of the GBU-39 bomb known as the Focused Lethal Munition (FLM) which had a larger explosive payload but was designed to cause less collateral damage, this was not the variant used in this case.

The FLM has a carbon fiber composite warhead filled with tungsten powder. FLM test images showed objects in the test coated with tungsten dust, which is not present [in video of the scene].”

The serial numbers on the munitions remnants also matched those of a California-based GBU-39 parts manufacturer — indicating further evidence that the bombs were manufactured in the United States.

Two additional explosive weapons experts – Richard Weir, a senior crisis and conflict researcher at Human Rights Watch, and Chris Lincoln-Jones, a former British Army artillery officer and weapons and targeting expert – identified the fragment as part of a US-made GBU bomb. 39 When reviewing the video for CNN, though, they were unable to comment on the alternative used.

In response to a request for comment on the munitions used in the Rafah raid at a news conference on Tuesday, Pentagon Deputy Press Secretary Sabrina Singh told reporters: “I do not know what type of munitions were used in that airstrike. “I have to refer you to the Israelis to talk about this.”

CNN also contacted the US National Security Council.

The United States has long been the primary supplier of arms to Israel, according to data from the Stockholm International Peace Research Institute (SIPRI), and this support has continued despite mounting political pressure on the Biden administration over the attack on Gaza.

Last month, Biden signed a foreign aid bill that included $26 billion for the conflict between Israel and Hamas — including $15 billion in Israeli military aid, $9 billion in humanitarian aid for Gaza, and $2.4 billion for regional U.S. military operations.

CNN's identification of the munition is consistent with a claim by IDF spokesman Admiral Daniel Hagari in a press conference about the tragedy on Tuesday.

Hajjari told reporters that the raid — which he said targeted senior Hamas leaders — used two munitions with small warheads containing 17 kilograms of explosives, adding that these bombs were “the smallest munitions that our aircraft can use.” The conventional GBU-39 warhead has an explosive payload of 17 kilograms.

Hajari said that the deadly fire that occurred after the raid was not caused solely by the weapons used by the Israeli army.

“Our munitions alone could not have started a fire of this size,” Hagari said, adding that the Israeli army was investigating “what might have caused such a large fire to ignite.”

He added that Israel was investigating whether the strike “inadvertently released potentially stored weapons in a nearby compound.”