One person has been killed and five people including a child have been airlifted to hospital after a crash on the M25 near Lakeside in Essex.
The crash involving three lorries and five cars happened around 12.30pm and the southbound carriageway is closed.
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The assault took place after a woman got on the train from Oxford Circus station with three children aged between two and five.
The sex offender was reportedly transferred from HMP Wakefield in West Yorkshire to HMP Belmarsh, south-east London.
Officials say the lizard, about 30cm long, is believed to be a Bengal variety, but it is not known where the reptile's journey started.