WORLD : Worker Suspected in Pan Am Crash

<i> From Times wire services </i>

British investigators now believe the bomb that tore apart a Pan Am airliner over Scotland last month, killing 270 people, was probably smuggled aboard by a worker at London’s Heathrow Airport, West German intelligence sources said today.

The sources said British investigators were working from the theory that the explosive was placed in a passage directly under the cockpit, connecting it with the baggage hold. The sources said British media speculation that the bomb might have been planted in a passenger’s luggage in a connecting flight from Frankfurt and then transferred to the jumbo jet at Heathrow is being increasingly discounted by British investigators.