A public order charge against Greta Thunberg has been thrown out.
District Judge John Laws said that police attempted to impose “unlawful” conditions during the environmental protest.
The 21-year-old climate campaigner was arrested during a demonstration near the InterContinental Hotel in Mayfair on 17 October.
The judge said that the conditions imposed on protesters were “so unclear that it is unlawful”.
He added that it meant that “anyone failing to comply were actually committing no offence”.
Ms Thunberg appeared at Westminster Magistrates’ Court after previously denying breaching the Public Order Act 1986.
She is accused of breaching section 14 of the act by blocking the entrance to the hotel.
Ms Thunberg appeared at court along with two Fossil Free London protesters and two Greenpeace activists, who also pleaded not guilty to the same offence.
Oil executives had been meeting inside for the Energy Intelligence Forum.
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