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Tulisa Contostavlos drugs trial collapses

21 July 2014 Last updated at 19:57 BST

Singer and TV star Tulisa Contostavlos's trial over drugs allegations has collapsed.

Judge Alistair McCreath told Southwark Crown Court he thought prosecution witness Mazher Mahmood had lied in giving evidence.

Mr Mahmood claimed Ms Contostavlos, 26, had brokered a deal through her friend Mike GLC to supply Class A drugs.

The Sun journalist Mr Mahmood has been "suspended pending an internal investigation" the newspaper said.

David Sillito reports.