WASHINGTON (Reuters) -U.S. consumer confidence unexpectedly deteriorated in June as households worried about business conditions and employment prospects over the next six months.

The Conference Board said on Tuesday its consumer confidence index dropped 5.4 points to 93.0 this month, erasing nearly half of the sharp gain in May. Economists polled by Reuters had forecast the index increasing to 100.0. 

"The decline was broad-based across components, with consumers' assessments of the present situation and their expectations for the future both contributing to the deterioration," said Stephanie Guichard, senior economist, global indicators at the Conference Board. "Their appraisal of current job availability weakened for the sixth consecutive month but remained in positive territory."