Four workers were injured when a device exploded at 0923GMT in the post room at the Driver and Vehicle Licensing Authority's main centre in Swansea.

Two men and two women were taken to hospital. One woman stayed on to be treated for cuts to her hands and body.

Two men suffered blast wounds to their hands and upper bodies in an explosion at accountancy company Vantis in Wokingham, Berkshire.

Police were called to the offices in Oaklands Business Centre, just after 0900 GMT when an item of mail ignited.

The two victims, both in their 30s, were treated at the scene for minor blast injuries and the building was evacuated.

The package was addressed to a company called Speed Check Services, which provides digital speed cameras to the police, but was opened by a Vantis employee.

Maja Kurcwald, a Polish national, suffered minor injuries in an explosion at the Capita office building in Victoria Street, central London.

She was taken to hospital for treatment to her injuries after opening a package.

Capita runs London's congestion charge system as well as providing HR and payroll services to central and local government departments and the police, and IT services to schools.

A device exploded at a house in Folkestone, Kent.

Mike Wingfield, 53, received minor injuries, and his wife Rosemary was also hurt in the blast.

Michelle Evans, a pregnant receptionist at Orchid Cellmark, which processes DNA samples, suffered a minor injury to her hand.

The name of Barry Horne - an animal rights campaigner and convicted fire-bomber who died in 2001 - was written on the envelope.

A package was sent to LGC Forensics in Culham, near Abingdon, but was intercepted.

LGC, which employs 1,000 people, was formerly the Laboratory of the Government Chemist and still has a statutory role.

The Forensic Science Service, a government-owned company which also provides scientific services to the police, received a suspect package.

As with the Culham attack, the package was intercepted and did not explode.