Mohammed Shahid Ali, 38, is wanted on recall to prison having “failed to comply with the conditions of his release.” He was last seen in Tilbury, Essex, but police say he has links to London, Kent, Norfolk and Suffolk.
Ali may pose a risk to the public and young children, the Metropolitan Police warned.
The man is known to commit offences on railways and the London Underground network, reports Essex Live.
Ali has receding hair which is grey/curly and messy on the sides and he has a thick beard.
He typically wears a woolly hat. navy blue jogging bottoms, black jacket and red/white trainers.
Anyone who knows the whereabouts of Ali should call police on 999 immediately.
Anyone with any information is asked to call police on 101 or contact via Twitter @MetCC. Please quote CAD 3579/13JAN
To give information anonymously contact Crimestoppers on 0800 555 111 or online at crimestoppers-uk.org.