A woman has been injured by a letter bomb which exploded at the main DVLA centre in South Wales, police say.
A woman has been injured by a letter bomb which exploded at the main DVLA centre in Swansea, the fourth mail blast incident in five days.
The attack, which happened at about 0930 GMT, is the third of its kind on motoring-related companies this week.
The attack, at about 0930 GMT, is the third of its kind on motoring-related companies this week.
Police said the latest blast happened in the post room of the Driver and Vehicle Licensing Agency, Swansea. The victim's condition is stable.
The bomb exploded in the post room of the Driver and Vehicle Licensing Agency. The injured woman is stable.
Kent police are also investigating a letter bomb which injured a man at his Folkestone home on Saturday.
Kent police are also investigating a letter bomb which injured a man at his Folkestone home on Saturday.
Officers are trying to establish whether there is any connection between the three other attacks and the letter bomb received by the 53-year-old man, who suffered minor injuries.
An accountancy firm in Berkshire was targeted on Tuesday, and the central London offices of Capita on Monday.
An accountancy firm in Berkshire was targeted on Tuesday, and the central London offices of Capita on Monday.
A South Wales Police spokeswoman said the woman had been injured in "a small letter-type explosion" at about 0923 GMT and had been taken to hospital.
A South Wales Police spokeswoman said the woman who had been injured at the DVLA had been involved in "a small letter-type explosion" at about 0923 GMT and had been taken to hospital.
In a statement, Morriston NHS Trust, said: "She is undergoing treatment at the present time and has been assessed by a consultant. Her condition is stable."
In a statement, Morriston Hospital, where the injured woman was taken, said: "She is undergoing treatment at the present time and has been assessed by a consultant. Her condition is stable."
A cordon has been put in place around the scene and access roads have been closed.
A cordon has been put in place around the scene and access roads have been closed.
But police said the DVLA building and surrounding areas had not been evacuated so far.
But police said the DVLA building and surrounding areas had not been evacuated so far.
Investigation
Investigation
It is the third letter bomb attack in three consecutive days and detectives are now investigating whether they are linked.
On Tuesday a package exploded at the Berkshire offices of an accountancy firm linked to Speed Check Services, based in Camberley, Surrey, the provider of digital speed cameras to the police.
On Tuesday a package exploded at the Berkshire offices of an accountancy firm linked to Speed Check Services, based in Camberley, Surrey, the provider of digital speed cameras to the police.
MAIL-BOMB LOCATIONS 1 Capita, London - 5 Feb 20072 Vantis, Wokingham, Berks - 6 Feb 20073 DVLA, Swansea - 7 Feb 2007
MAIL-BOMB LOCATIONS 1 Folkestone, Kent - 3 Feb 20072 Capita, London - 5 Feb 20073 Vantis, Wokingham, Berks - 6 Feb 20074 DVLA, Swansea - 7 Feb 2007
That followed a letter bomb attack the day before at the central London offices of Capita, which runs London's congestion charge system.
That followed a letter bomb attack the day before at the central London offices of Capita, which runs London's congestion charge system.
John O'Connor, a former Metropolitan Police commander, said that whoever was behind the attacks seemed to know what they were doing.
In a separate incident on Wednesday, a controlled explosion was carried out on a package found on a road in Havant, Hampshire.
It was a person "of reasonably high intelligence" because of the required skill in making the devices, he said.
Peter Power, a former senior officer at Scotland Yard, told the BBC that the police would be looking at whether they were dealing with a "disgruntled" motorist.
"This, for me, has got all the hallmarks of somebody that has become deranged over something."
"I've got no doubt whatsoever that the police are desperately trying to think about who the perpetrators might be," he said.
"Are they trying to draw attention to a cause, are they or is he or is she just a very disgruntled motorist. So there is some connection and the police I'm sure will be trying to find that out."
Nigel Humphries, from the Association of British Drivers, told BBC Five Live that he was "appalled" by the apparent bombing campaign.
He added: "In fact, it makes us feel a bit guilty that we haven't campaigned hard enough on the legitimate front against the things that we oppose, to do with criminalising and bullying motorists and because of our failure to campaign hard enough, somebody's had to resort to this."
'Worrying'
'Worrying'
Home Secretary John Reid described the incidents as "worrying".
Home Secretary John Reid described the incidents as "worrying".
But he added: "It is important we allow police to get on with their investigation without undue speculation."
But he added: "It is important we allow police to get on with their investigation without undue speculation."
Nigel Humphries, from the Association of British Drivers, told BBC Radio Five Live he was "appalled" by what appeared to be linked attacks.
"In fact, it makes us feel a bit guilty that we haven't campaigned hard enough on the legitimate front against the things that we oppose, to do with criminalising and bullying motorists, and because of our failure to campaign hard enough, somebody's had to resort to this."
Alun Cairns, Welsh Conservative Assembly Member for South Wales West, sent his "sympathy and best wishes" to the injured DVLA worker.
Alun Cairns, Welsh Conservative Assembly Member for South Wales West, sent his "sympathy and best wishes" to the injured DVLA worker.
He said he planned to set up meetings with the DVLA, police and staff to discuss "protecting personnel in the workplace".
He said he planned to set up meetings with the DVLA, police and staff to discuss "protecting personnel in the workplace".
The DVLA maintains registers of drivers and vehicles.
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