World crude oil futures fell Tuesday on the eve of an energy stockpiles report.

Light, sweet crude for May delivery lost 51 cents to 63.10 dollars a barrel on the New York Mercantile Exchange.

Brent crude for June delivery fell 1.32 dollars to 65.93 dollars a barrel on the ICE Futures exchange in London.

The Energy Department will release its energy stockpiles during last week on Wednesday.

The Organization of the Petroleum Exporting Countries (OPEC) said in a monthly report on Monday that it kept its forecast of 1. 5 percent this year unchanged for growth of world oil demand.

"World oil demand growth in March was not as strong as in the previous month, although oil demand picked up worldwide due to the normal winter in North America and strong economic activities in the Middle East," said the report.