A primary school caretaker has been found guilty of carrying out a letter bomb campaign in which a Solihull company was targeted.

Miles Cooper, 27, from Cambridge, had denied the charges but told a jury at Oxford Crown Court he sent seven devices to organisations around the country - in London, Berkshire, Oxfordshire, Kent and Swansea - in protest at the Government's "overbearing" control. The Forensic Science Service in Solihull was also one of the companies targeted.

Eight people were injured when they exploded.

Cooper told the court: "The overall goal was to shut down certain departments in certain buildings and ultimately to highlight my cause."

Cooper had denied eight counts of causing bodily injury by means of an explosive substance, two counts of using an explosive substance with intent to disable, one count of making explosives and one alternative count of possessing an explosive substance.  He was convicted on all counts.

He did not contest that he sent the letters to three forensic science laboratories, a computer company, an accountancy firm, the DVLA and a residential address, but he denied intending to cause any injury.

Of the seven devices sent through the post, five exploded. Recipients who opened the padded envelopes were showered in glass fragments or nails, the court was told.