3rd Letter Bomb Explodes in Britain in 3 Days

LONDON, Feb. 7 — A letter bomb exploded at Britain’s drivers’ licensing agency today, extending what the police depicted as a coordinated series of attacks that has troubled the nation’s leaders and inspired comparisons with the Unabomber in the United States.

The blast at the Driver and Vehicle Licensing Agency, which slightly injured four people, was the third in as many days, striking mainly at institutions and companies involved in regulating motorists and automobiles.

The licensing agency, located at Swansea in south Wales, collects automobile taxes as well as issuing drivers’ licenses. The other targets this week were companies associated with collecting congestion charge fees for cars entering central London and with supplying cameras used to monitor traffic flows.