In January, a man in Arizona, in the US, documented how his

One military expert told BBC Verify that any engagements under 50m to 100m would be considered as being within close range.Robert Maher, an audio forensics expert at Montana State University, said towards the start of the footage one firearm is discharged about 43m away from the mobile phone.

Mr Maher and another expert, Steven Beck, independently corroborated one another's view that in the final few moments of the audio, shots are fired as close at 12m away.Mr Beck, a former FBI consultant who now runs Beck Audio Forensics, said: "The shooter(s) at these times is much closer, with distances of 12m to 18m. There is a strange pop sound that may be a tire hit by a bullet."He added: "The shockwaves indicate that the bullets are passing close to the recorder microphone - meaning they are being shot at."

Chris Cobb-Smith, a former British Army officer with over 20 years experience in conducting investigations in conflicts zones, said that at 50m the Israeli troops would have "definitively been able to identify the convoy as humanitarian" and would have been able to "determine that the personnel were unarmed and not posing a threat".Voices can also be heard towards the end of the recording, shouting in Hebrew: "Get up," and: "You (plural) go back".

Over the period of more than five minutes, at times, multiple firearms were in use simultaneously, the audio experts determined.

Mr Maher said "the sounds are often overlapping in such a way that it is clear multiple firearms are in use at the same time".A defence source also told the BBC the commitment to build up to 12 new attack submarines would require an increase in defence spending to at least 3% of GDP.

Ministers say they expect to spend 3% of GDP on defence by 2034 at the latest but have given no guarantees - and the run-up to the review's release has been dominated by a political row over when government will hit the milestone.The Conservatives say the move - which would hike spending by around £20bn a year - should be met by the end of the decade.

Cartlidge said that "without the funding, [the review] is an empty wish list" and the "ships and submarines it talks of are a fantasy fleet".The government "wants to send a strong message to Moscow, but the messages he's sending are profoundly weak", Cartlidge added.