A judicial inquiry into the bombing of Pan Am Flight 103 was adjourned Tuesday after a lawyer representing relatives of American victims died in a car crash.

Michael Hughes, 37, was killed as he drove to his hometown of Glasgow to meet a New York lawyer after Monday's session. His car was struck by a truck that went out of control on the M74 highway just south of Glasgow, police said.Hughes, a father of five, had worked with the U.S. group of relatives since the disaster, which cost 270 lives, 21 months ago.

The inquiry was adjourned until Thursday when witnesses of the aircraft crash in Lockerbie, Scotland, will be heard.

Monday was the first day of the inquiry into the terrorist bombing of the Boeing 747 that was en route from Frankfurt, West Germany, to New York after stopping in London on Dec. 21, 1988.

The inquiry is not seeking to determine criminal responsibility for the deaths of the 259 people who were aboard the plane and 11 people on the ground in Lockerbie, where the plane fell. The question is being handled by police and various international agencies.

News of his death stunned lawyers, officials and victims' relatives at the inquiry.