U.S. crude is back above $84 as last week's anticipation of a U.S.-Iran deal dissipates.

Concerns over supply disruptions pushed oil prices higher, amid news of recent deadly attacks on vessels in the Gulf of Oman and the Red Sea, and as a spill near Oman worsens.

Oil prices rose early Friday after the U.S. said its naval blockade of Iranian ports could continue "indefinitely".

The world watches oil prices surge past $82 per barrel and the U.S. Strategic Petroleum Reserve dip to its lowest level since ...