Last night’s attack at the Manchester Arena, coming moments after the conclusion of a concert by Ariana Grande, has sent shockwaves across the world.  Taoiseach, Enda Kenny, this morning expressed the revulsion of this nation towards this grotesque act, and sent condolences on behalf of the Irish people to everyone affected. At the time of writing, 22 people have been confirmed dead and 59 injured. And inevitably, amongst the dead, young children will be counted.

At this point, the investigation into what happened has swung into action and, although it is too early to confirm with any certainty how exactly the attack was carried out, Security Analyst, Tom Clonan, has a strong suspicion as to the nature of the device used. Speaking on the Today programme, presented this morning by John Murray, Tom outlined the particular signature of the device, and expressed concern that the perpetrator may not have acted alone.

"I think at this point, the clues seem to indicate this type of peroxide bomb, TATP,  triacetone triperoxide. This is the type of device that was used in the 7/7 bombings…. Also the type used in the Bataclan attack… They can be carried either in a backpack or a suicide vest. They are detonated creating this huge air blast.”

According to Tom Clonan, there are three types of bomb that could be used in these types of attacks. Firstly, car bombs, which are nitrocellulose based. Essentially, nitrogen-based, like a fertiliser bomb. But they are very bulky and usually concealed in a vehicle. Secondly, high-explosive bombs, using plastic explosives. But one of the characteristics of such a bomb is its heat signature, generating a large fire. So far, this is inconsistent with reports from the scene.

This leaves the peroxide bomb, TATP, the implications of which will cause additional worry for security services.

“I’d be very worried about this attack,”, said Tom. “Unlike the previous lone wolf attacks, where you drive a car of on Westminster Bridge…. peroxide bombs, even though the ingredients are readily available, they are highly unstable. Most people who attempt to make them are actually blown themselves in the mixing process.” TATP bombs send out a shockwave, according to Tom, that can travel at up to 5600 metres per second, but do not generate the same fire blast as other explosives. But, unlike basic fertiliser bombs, they are tricky to put together and usually require instruction.

“If it proves to be a peroxide bomb, and I’m sorry to say, based on my own professional background and experience, that’s what it sounds like, the person involved will have required some instruction. I don’t think it would be sufficient to look at it on the Internet and then make one yourself, like a DIY. That is a very sinister development and I imagine the Greater Manchester police will be very anxious to try to identify if there is support of a cell structure there.”

Also joining John Murray to discuss the attack and its horrific aftermath were Vincent McAviney, Senior Reporter at LBC Radio, and Brendan Pittaway, a Manchester-based Journalist.  You can listen back to the full interview by clicking here.

Facebook has activated its safety check feature so people can let loved ones know they are safe, and an emergency helpline, 0161 856 9400, has been set up for those searching for loved ones.

Main Photo: Leon Neal/Getty Images