UN envoy warns of escalation after Houthi rebel missiles smash into a military training camp mosque in central province of Marib

Iran-backed rebels said to use missiles and drones in assault on training base in Marib, east of Sana'a, as fighting ramps up after months of relative calm

Tehran's nuclear activities and tanker attacks, as well as targeting of Saudi oil facility and US drone, along with Trump's pullout from nuke deal, all contributed to situation

The Iranian general helped build a vast network of Iranian influence through the region; now Iran could mobilize them to avenge his death and dramatically expand the battlefield

Leader of Iranian-backed group claims it has a 'bank of targets' prepared in revenge for alleged Israeli involvement in his country's conflict

Officials say 'significant cache' of weapons, which contravene UN Security Council resolutions on Yemen conflict, showcase Tehran's backing of Houthi rebels in the country

Iran's regional ambitions have backfired, King Salman says as violent street protests engulf arch-foe Tehran

Deal designed to halt months of clashes between fellow members of Saudi-led coalition battling Houthi rebels

Houthis say they've captured 'thousands' of military personnel in assault near border with the southern Saudi region of Najran; no confirmation from Riyadh

Hatami says any arrangement with the US would damage his country's capabilities; Guards chief says Tehran showing 'restraint' but will respond to 'troublemakers'