Iran said Monday it expected a framework for negotiations with the United States would be ready in the coming days, as President Donald Trump threatens military action against Tehran.

"Countries of the region are acting as mediators in the exchange of messages," foreign ministry spokesman Esmaeil Baqaei said, without giving details on the content of any prospective negotiations.

Iran said Monday it 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.

The move comes as Iran faces the threat of U.S. military action in response to the killing of peaceful demonstrators and over possible mass executions. The American military has moved the USS Abraham Lincoln and several guided-missile destroyers into the Mideast. It remains unclear whether President Donald Trump will decide to use force, though regional countries have engaged in diplomacy in an effort to halt a new Mideast war breaking out.

Gaza's Rafah border crossing with Egypt reopened on Monday for limited traffic, a key step as the Israeli-Hamas ceasefire moves ahead, according to Egyptian and Israeli security officials.

An Egyptian official said 50 Palestinians would cross in each direction in the first day of the crossing's operation. The official, involved in talks related the implementation of the ceasefire deal, spoke to The Associated Press on condition of anonymity to discuss the issue.

U.S. President Donald Trump has said he was hopeful of agreeing a deal with Iran after the country's supreme leader warned that any U.S. attack on the Islamic republic would trigger a regional war.

Following the Iranian authorities' deadly response to anti-government protests that peaked last month, Trump has threatened military action and ordered the dispatch of an aircraft carrier group to the Middle East.

Syria's interior ministry said Sunday that its forces had dismantled a cell that was responsible for recent attacks targeting Damascus' Mazzeh district, saying the weapons came from Lebanon's Hezbollah.

Iran's supreme leader on Sunday likened recent anti-government protests to a "coup", warning that any U.S. attack on the Islamic republic following Washington's military deployments in the Middle East would trigger a regional war.

Iran's top security official said Saturday that progress had been made towards negotiations with the United States, even as the Islamic republic's army chief warned Washington against launching military strikes.

U.S. President Donald Trump on Saturday said Iran was negotiating with the United States, even as the Islamic republic's army chief warned Washington against launching military strikes.

"(Iran is) talking to us, and we'll see if we can do something, otherwise we'll see what happens...We have a big fleet heading out there," he told Fox News.

An explosion took place on Saturday at a building in the Iranian city of Bandar Abbas on the Gulf coast, state media reported, though the cause of the blast was as yet unknown.

Iranian army chief Amir Hatami on Saturday warned the United States and Israel against an attack, saying his country's forces were on high alert following Washington's heavy military deployments in the Gulf.