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Supporters of Yemen’s Shiite Huthi opposition movement receive medical treatment at a hospital after they were injured in clashes with security forces on September 9, 2014 in the capital Sanaa. Image Credit: AFP

Sana’a: Yemeni soldiers opened fire on protesters trying to storm the cabinet building in the capital Sana’a on Tuesday, killing at least four, a medical sources.

The anti-government activists loyal to Al Houthi religious insurgent group said dozens were wounded in the bloodiest day of tense demonstrations that have gripped Sana’a for weeks and now threaten to descend into outright conflict.

A security source speaking on condition of anonymity said marchers “tried by force to storm the cabinet, so the forces guarding it undertook their legal duty to stop them.” Protesters have blocked the main road to Sana’a’s airport and have held sit-ins for weeks at ministries in an attempt to oust the government and restore fuel subsidies.

Al Houthis accuse the government of corruption, while the group’s critics say it is trying to grab power and carve out a semi-independent state for itself in the north — something it denies.

While activists hold rallies in the capital, armed Al Houthi rebels in Northern Al Jawf province have fought government-allied tribes backed up air strikes over the last three days.

Both sides vowed defiance on Monday, as the International Crisis Group think tank said “Yemen’s troubled transition is at a crossroads more dangerous than any since 2011,” when mass protests ousted veteran autocrat Ali Abdullah Saleh and security around the country sharply deteriorated.

“The Al Houthi group may not and cannot continue its escalation and its disturbance of the public tranquillity and the undermining of security and stability in the capital,” Salah’s successor, President Abd Rabbo Mansour Hadi, said.

Al Houthi leader Abdul Malek Al Houthi said: “We vow to continue in our position and dismiss any questioning of our intentions. The solution is to respond definitively to the popular demands, and we are serious in these demands.” Separately, Al Qaida militants detonated a car bomb at an army checkpoint in the eastern Hadramout province, setting off a firefight in which three soldiers and 10 militants were killed, a local security source said.

The United States and Yemen’s Gulf neighbours fear for the impoverished country’s stability as it battles Al Qaida in the Arabian Peninsula, one of the fiercest affiliates of the global militant group, and struggles with sectarian rifts which have led to warfare in other Arab countries.