Both were arrested the day after the killing, shortly after the girl's mother rang Cheshire police to say that the teenagers had been with Brianna on the afternoon she was killed, a jury was told yesterday.
The girl, who was then 15 and is known as X to protect her identity, had told her mother she was with Brianna in Culcheth Linear park, near Warrington, on 11 February, shortly before she was stabbed 28 times in a "sustained and violent" attack.
X claimed that she and her codefendant, a 16-year-old boy known as Y, had met Brianna and "chilled" in the park before Brianna said she had to go and "meet a lad from Manchester."
Manchester crown court heard. She said she did not know the boy but that he was 17.
Both defendants deny murder and each accuses the other of the stabbing.
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