SAN SALVADOR, El Salvador (AP) _ An estimated 100 demonstrators hurled rocks at the U.S. Embassy in one of the most violent demonstrations recently against Washington, which supports the government against leftist rebels.

Many of the people taking part in Friday's protest said they were from the Christian Committee for the Displaced. Members of that group occupied several Roman Catholic churches on Thursday and then left to join in the demonstration.

As the marchers passed the fortified embassy, some painted slogans on the compound's wall and others tossed stones for about 15 minutes. Police stood by but did not intervene.

Among the slogans were, ''Yankee trash, get out of El Salvador 3/8'' and ''Because of Americans we are dying 3/8''

An estimated 400,000 people have been displaced during the civil war, now in its eighth year. Human rights groups say more than 63,000 people, mostly civilians, have been killed.