Oliver Stephens was killed on January 3 (Image: Thames Valley Police / SWNS)

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A 13-year-old boy was "lured" to a park by a girl and then "ambushed" by two teenagers who stabbed him and left him to die, a court has heard.

Oliver Stephens, known as Olly, was killed at Bugs Bottom field in Emmer Green, Reading, Berkshire, on January 3 this year.

The attack was arranged by a teenage girl, jurors were told.

Both alleged attackers were said to have had "grievances" with Olly.

The two boys, who are now 14, deny murder and are on trial at Reading Crown Court.

The girl, also 14, and one of the boys have both admitted manslaughter.

The boy was stabbed at Bugs Bottom field in Emmer Green, Reading
(Image: Berkshire Live / Darren Pepe)

None of the three can be named for legal reasons.

Opening the prosecution case, Alison Morgan QC said: "(The girl) lured Olly to the location of the attack, in a place called Bugs Bottom, and she lured him to allow the attack to be carried out by the two defendants.

"The attack had been planned by the defendants in the days leading up to the attack.

"The defendants were motivated by perceived grievances with Olly.

Flowers left for Olly at the scene of the stabbing
(Image: Berkshire Live / Darren Pepe)

"At least one of the two of them had a knife with them.

"They carried out a joint attack, during the course of which one of the two of them used the knife they were carrying to stab Olly – once to the chest and once to the back."

Ms Morgan said the defendants then fled the scene before getting rid of incriminating evidence, such as mobile phone data and clothes worn during the attack.

She said the younger boy, who was 13 at the time, used a knife to stab Olly, but that the older boy must have known he was carrying the weapon.

Jurors were told the attack was arranged by a teenage girl
(Image: Berkshire Live / Darren Pepe)

The prosecutor said the girl was also present at the scene during the attack.

She said: "Putting it bluntly, Olly was ambushed by these defendants.

"He was physically attacked by (the two boys) and with (the girl) standing by, lending assistance by her presence.

"There were others who were also present but did not play a significant role in the attack."

The trial is being held in special circumstances, with counsel removing their wigs and gowns due to the defendants' ages.

The trial continues.