A MANCHESTER schoolgirl arrested with a Blackburn teen involved in a plot to attack police officers at an Anzac Day parade in Australia has pleaded guilty to two terror offences.

The 16-year-old girl, who cannot be named because of her age, was arrested in April along with Britain's youngest jihadi terrorist, a boy of 14, from Blackburn, who encouraged an Islamic State-inspired terror attack on police officers at the parade.

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The girl pleaded guilty to two offences under section 58 of the Terrorism Act 2000 when she appeared at the Youth Court at Manchester Magistrates' Court.

It is alleged that on or before April 3 this year, the girl possessed a document containing information of a kind likely to be of use to a person preparing or committing an act of terrorism, namely a recipe for explosives and the same charge relating to a second document.

She was held by police in April following an investigation by the North West Counter Terrorism Unit.

The girl, who is on bail, will appear at Manchester Magistrates' Court later.