A second letter bomb exploded in the UK this morning injuring two men.

The Wokingham office of accounting firm Vantis was the target of the bomb, which exploded at 9.00am. The men did not require hospital treatment. This follows a letter bomb sent to Capita yesterday. Capita's projects include the London Congestion charge and a slew of national and local government contracts.

The Evening Standard described Vantis as a company "involved in speed cameras". Berkshire police told the BBC it was aware of both bombs, but said it was too soon to link the two.

Capita, which was hit by a letter bomb yesterday, said the employee injured in the explosion at its Victoria office was making a steady recovery. It issued the following update:

Capita confirms that there was a contained incident at one of its London offices yesterday involving a small explosion in a post room. One member of staff sustained minor injuries. The incident is being investigated by police.

Full contingency plans were activated immediately and staff relocated to nearby offices, so business continued with little disturbance. All information and IT systems were secure and unaffected by the incident. Full operations have now been resumed at this office.

We are fully supporting police enquiries and are working with the Royal Mail to review and improve post handling procedures Group-wide.

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