Administration must decide Thursday whether it will nix sanctions waivers to foreign companies working on civilian nuclear program, thereby risking an escalation with Tehran

Bulk carriers have been stuck at Paranagua port since early last month after oil giant Petrobras refused to provide fuel for fear of breaching US sanctions

Families are hit hard by the collapse of the national currency, accelerating inflation, eroding wages and spike in housing prices -- fallout from unprecedented American measures

US president brands Tehran world's top 'state of terror,' says Washington prepared for the worst

Britain says priority is to deescalate, but that it is unacceptable for Tehran to threaten shipping in international corridors

Move could include calling on EU and UN to snap back penalties lifted under nuclear deal as Europe urges Tehran to release ship

Petrobras says vessels belong to a company sanctioned by the United States

US president says aircraft came within 1,000 yards of USS Boxer and ignored calls to stand down, calls it the latest 'hostile' act by Tehran

Zarif tells conference that sanctions amount to 'targeting innocent civilians' as Washington sharply restricts his movements during New York visit

Police in British territory say the captain, 3 officers from Grace 1 released without charge, investigation continuing