The horrifying messages the two 12-year-old murderers sent each other after killing Shawn Seesahai have been revealed.

Seesahai’s killers commented on the stabbing, declaring “it is what it is”, a day after the pair attacked the teenager with a machete.

The two boys have become the youngest knife murderers in the UK after they stabbed the 19-year-old through the heart with a 42.5cm-long machete last November.

In a conversation retrieved by police, the two discussed their murder in a chilling exchange on social media app Snapchat.

“Everyone's talking abt (sic) it, literally everyone, everyone knows,” the first killer said.

The second responded with a voice note where they said: “It is what it is.”

The pair, who were both found guilty of murder at Nottingham Crown Court yesterday, then shared more messages, saying: “I'm scared man” - before the other says “I'm not”, followed by the acronym “IDRC” which means “I don't really care”.

The first killer responds with a voice note: “I ain't said nowt (sic) cause every time I talk about it, like I act weird apparently so (inaudible) comes and goes.”

“I'm just scared your you too (sic),” the other replies.

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The pair of 12-year-olds, who blamed each other for the killing, have become the youngest convicted murderers since Jon Venables and Robert Thompson were detained for killing James Bulger, more than 30 years ago.

The jury deemed both responsible, even though only one of them had struck the fatal blow.

Family members of both the victim and the defendants cried and hugged each other in the public gallery as jurors unanimously found both boys guilty of murder.

During the month-long trial at Nottingham Crown Court, the jury was told that the 19-year-old victim went to Wolverhampton’s Stowlawn playing fields on November 13 with a friend. They were sitting on a bench when they encountered the two boys, who had been with two girls of the same age.

Seesahai was shoulder-barged by the smaller of the two defendants, who “often” carried a machete, before being punched, kicked, stamped on and “chopped” at with the weapon.

The victim’s friend, who was with him at the time of the attack, said they both fled, however Seesahai stumbled and fell to the ground.

The 19-year-old was struck with the weapon on his back, legs, and skulls, with a blow so hard on the latter that a “piece of bone had actually come away”, jurors were told.

Seesahai, a stranger to the two boys, was pronounced dead just after 9pm, after police and paramedics were called to the scene.

As well as failing to summon help for Seesahai, the defendants showed no remorse for what they had done in the 24 hours before their arrest – with one cleaning the machete with bleach and hiding it under his bed.

Prosecutor Michelle Heeley KC said that the victim was attacked “despite the fact Shawn Seesahai and his friends had offered no violence, nor done anything to offend (the boys)”.

The two 12-year-old murderers, who cannot be named for legal reasons, are expected to be sentenced in July.

Det Insp Damian Forrest from West Midlands Police, described the case as “shocking”.

“Sadly, this is not the first case that I have investigated of a young man losing his life to knife crime but it is the first that I have looked at two 12-year-olds being responsible,” he said.

“That is something that took me by surprise and will stay with me.”