Spears' assistant denies breaking down door

Britney Spears' assistant Alli Sims has denied reports she broke down a door with a hammer after the singer barricaded herself in a bathroom with her baby son Jayden James.

Spears was involved in a dramatic stand-off with emergency services at her Beverly Hills, California mansion on Thursday night after refusing to hand over Jayden James and his brother Sean Preston to their father Kevin Federline.