Letter-bomber could be motorist

• Bomb set off at DVLA today
• One person hurt in blast
• Explosion is third in three days

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A disgruntled motorist could be behind a series of letter-bombs that have exploded in the last three days.

Three companies with links to motoring have so far been targeted, the latest device exploding at the Driver and Vehicle Licensing Agency (DVLA) today, which injured one worker.

Yesterday, a package exploded at the offices of an accountancy firm connected with a speed camera company, while Capita, which administers the congestion charge in London, was targeted on Monday.