N-Dubz star Tulisa Contostavlos is accused of setting up an £860 deal for 13.9 grams of cocaine to an undercover reporter.
She has denied the charge at Westminster Magistrates Court.
She appeared alongside rapper Mike GLC, also known as Michael Coombs, who denied a charge of supplying the drug.
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Police warned people not to approach the 32-year-old if they spotted him.
A witness said that the animals may have been spooked by the sound of a horn.
A fire engulfed much of the landmark building on Friday night.