British police investigating a series of letter bomb attacks have arrested a man in his 20s in Cambridgeshire.
Seven letter bombs were sent over the last month to businesses across Britain linked to forensic science laboratories and traffic enforcement.
The first letter bombs were sent to companies in Oxfordshire and the West Midlands area in January.
In each case, the companies received an A5 padded bag containing a crude firework-type explosive device.
Each had a similar return address, while Barry Horne, an animal rights extremist who died while serving an 18-year jail sentence for a firebombing campaign, was named on the back of one envelope.
Another letter bomb exploded at a house in Folkestone in Kent, injuring the 53-year-old man who opened it.
The first week of February saw three letter bomb attacks in consecutive days on motoring-related companies in London, Berkshire and south Wales.
And a blast in Swansea on 7 February left three people injured.
