Carl Robbins, 40, was last seen at the prison at 6am today.
Robbins was reported missing from the prison this morning (Sunday, July 19).
He was serving an indeterminate sentence for arson with intent to endanger life.
Robbins is described as white, 5ft 9ins tall, of medium build, with dark shaven hair and brown eyes. He has a large number of tattoos including some on his hands, neck, arms and legs.
He has connections to the Basildon area of Essex.
People are asked not approach him.
Anyone who may have seen him or anyone with information about where he is now is asked to contact officers by calling the national 24-hour police number 101.
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