By Parisa Hafezi DUBAI, Feb 2 (Reuters) - Iran is weighing the terms for resuming talks with the United States soon, a foreign ministry official said on Monday, after both sides signalled readiness to revive diplomacy over a long-running nuclear dispute and dispel fears of a new regional war.

The blast happened a day before a planned naval drill by Iran in the Strait of Hormuz, the narrow mouth of the Persian Gulf through which a fifth of all oil traded passes.

Iran says it has had summoned all of the European Union ambassadors in the Islamic Republic to protest the bloc’s listing of the paramilitary Revolutionary Guard as a terror group.

President Donald Trump said Iran is negotiating “seriously" with the U.S. as he keeps military options on the table and American naval forces move into the region.

The president said the U.S. will "hopefully" make a deal with Tehran.

An explosion has ripped through an apartment building in the Iranian port city of Bandar Abbas, killing a 4-year-old girl

As Trump weighs options on a possible strike on Iran, a senior Gulf official told Fox News that Saudi Arabia will not allow the U.S. to use its airspace or bases for such an attack.