US Senate OKs sanctions on Iran's fuel suppliers

The sanctions, approved on a voice vote, would target companies that export gasoline to Iran or help expand the country's oil-refining capacity by, in part, denying them loans and other assistance from U.S. financial institutions.

The House of Representatives has already passed similar legislation. Differences between the two bills will have to be worked out before the measure becomes law.

Lawmakers and the Obama administration fear Iran's uranium enrichment program will be used to develop weapons, while Tehran says it is for peaceful purposes such as generating electricity.

Many in Congress want to give Obama more tools to pressure Iran. Cutting off gasoline supplies would hurt Tehran's economy; while Iran has the world's third biggest oil reserves, it must import 40 percent of its gasoline to meet domestic demand because of a lack of refining capacity.