By Elwely Elwelly and Eman AbouhassiraDUBAI, Aug 28 (Reuters) - Iran condemned the United States' new economic sanctions on Friday as "state terrorism" and said other countries were legally obliged not to implement them.The Iranian foreign ministry's statement came as mediators stepped up efforts to reopen the Strait of Hormuz, which handled 20% of world oil supplies before the war began six months ago and whose status remains the biggest obstacle to a peace deal.

Tensions remain high as an oil tanker was struck near Oman, and the US has threatened sanctions against countries doing business with Iran

Iran and Oman are discussing a temporary transit corridor and mine-clearing effort for the Strait of Hormuz, but Tehran yesterday said the vital waterway would not be reopened…