After interviewing nearly 400 people on four continents, the Central Intelligence Agency says its officers had nothing to do with the explosion of crack cocaine in the United States.

In a still-secret report, the agency says it has found ''no information to indicate that the C.I.A. coordinated or condoned drug trafficking or had dealings with crack dealers,'' said a Government official who would not allow his name to be used.

A separate internal investigation into drug trafficking by C.I.A.-backed rebels in Central America is continuing, the official said.

The investigation that is now complete was intended to quiet a public outcry, amplified by radio talk shows and Internet chat rooms, that started with three news articles published by The San Jose (Calif.) Mercury News in August 1996.