Saudi Arabia beheaded a citizen on Tuesday after convicting him of murdering a compatriot, the interior ministry said.

Faris al-Qahtani was found guilty of shooting dead Hadi al-Yami and stealing his money and car, the ministry said in a statement carried by official Saudi Press Agency.

Saudi Arabian security forces on Tuesday arrested a second suspect in the fatal shooting of two policemen blamed on the Islamic State group, the interior ministry said.

Officers detained Nawaf bin Sharif Samir al-Anzi near the capital Riyadh after he opened fire on them, sparking an exchange of shots in which he was wounded, the ministry said in a statement carried by the official Saudi Press Agency.

Fighting between Shiite rebels and loyalists killed dozens of people across Yemen Tuesday as Iran accused Saudi Arabia of using Cold War-era tactics by air dropping leaflets warning of "Persian expansion."

A Saudi-led coalition carried out air strikes for a seventh straight day since announcing a halt to its aerial campaign, hitting Sanaa airport among other targets, an AFP correspondent and witnesses said.

At least 10 construction workers from Pakistan and one from India were killed in the collapse of a convention center being built in Saudi Arabia, an Asian diplomatic source said Tuesday.

The building, at a university in Qassim northwest of the capital Riyadh, collapsed on Monday.

U.S. top diplomat John Kerry on Monday said he would urge his Iranian counterpart to help ease the violence in Yemen, warning the country's future should not be decided by "external parties."

Kerry was due to meet later with Iranian Foreign Minister Mohammad Javad Zarif as negotiations on a nuclear deal move into a final phase.

The collapse of a convention center being built northwest of the Saudi capital left more than 50 workers trapped under rubble on Monday, official media said.

The collapse "happened at noon and resulted in more than 50 workers being trapped", the Saudi Press Agency said, adding that four wounded were recovered from the building site for Qassim University.

A coalition of Arab states vowed to coordinate political and military efforts to restore order in Yemen as Saudi-led warplanes Monday launched new air strikes on Shiite Huthi rebels.

The raids killed at least 12 Huthi insurgents and allied forces as fighting continued across several provinces, military and local sources said.

The U.N. Security Council went into closed-door consultations on Monday on the crisis in Yemen and to hear former envoy Jamal Benomar give a final report.

The Moroccan diplomat resigned earlier this month after losing the support of Gulf countries for his mediation efforts as Shiite Huthi rebels pushed their offensive.

Saudi-led coalition warplanes hit anti-government forces in south Yemen Monday, killing at least 12 Huthi insurgents and allied forces as fighting continued across several provinces, military and local sources said.

The aircraft pounded five schools converted by the Shiite rebels into military bases in Ataq, the capital of Abyan province, military sources said.

The commander of Iran's powerful Revolutionary Guards accused Saudi Arabia of treachery Monday, saying the bombing of Yemen had put the kingdom in the same camp as arch foe Israel.

The remarks, by General Mohammad Ali Jafari, are a further sign of deteriorating relations between Tehran and Riyadh, after recent heavy criticism by Iran's supreme leader and other top officials.