Suffolk crews are sent to the category C men's jail.

Officers say the investigation relates to banned goods being taken into wings within the jail.

The Ministry of Justice says four crews had to be sent to the blaze.

The tennis balls are retrieved by dogs working for the police and prison service.

Police are asking people to be vigilant after a number of post box thefts in Suffolk and Norfolk.

It is thought stolen post boxes are being sold to unscrupulous collectors, possibly around the world.