Terror suspects held at one of Britain’s most secure jails are secretly accessing the internet to contact their supporters. The discovery raises fears that some of the UK’s most dangerous terrorists could be plotting new attacks from inside prison. The serious security breach was revealed last week after The Mail on Sunday was alerted to messages on a “private” website linked to militant Islamic movement Al-Muhajiroun, which has been banned under anti-terror laws. The threatening emails were apparently sent from inside Belmarsh high-security prison in South-East London, which houses some of Britain’s most feared terror suspects. It is thought inmates are sending the illicit messages using smuggled mobile phones, many of which now allow access to the internet. The jail’s current prisoners include Abu Doha, who is accused of plotting to bomb Los Angeles Airport, and Dhiren Barot, who was jailed for life for planning terror attacks, including one using a radioactive “dirty” bomb. Jason Lewis reports.