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			 The defense ministry said the attack targeted the ministry's 
			hospital and most of the gunmen had been killed or wounded. 
 			"The attackers have exploited some construction work there to carry 
			out this criminal act ... the situation is under control," the 
			ministry said in a statement on its website.
 			No one claimed responsibility for the attack. But the U.S.-allied 
			country has been grappling with a security threat by al Qaeda-linked 
			militants, who have repeatedly attacked government officials and 
			installations over the past two years.
 			Witnesses said the explosion shook the compound in the old district 
			of Sanaa, where the country's central bank is also located.
 			"The attack took place shortly after working hours started at the 
			ministry, when a suicide bomber drove a car into the gate," the 
			defense ministry source said.
 			"The explosion was very violent, the whole place shook because of it 
			and plumes of smoke rose from the building," an employee who works 
			in a nearby building told Reuters. 			
			
			 
 			Ambulance sirens and gunshots were heard after the blast as soldiers 
			exchanged fire with the gunmen, said to have been disguised in 
			Yemeni army uniforms, who had stormed the compound.
 			A military source said that at least 20 people, including militants, 
			were killed in the attack and dozens were wounded. The Yemeni health 
			ministry appealed to citizens to donate blood to help save the 
			wounded.
 			At least two sources inside the defense ministry said the attackers 
			came in two vehicles. One was driven by a suicide bomber who 
			attacked the gate of the compound, while armed men entered the 
			compound in the second, the sources said. The ministry statement 
			made no reference to a suicide attacker.
 			
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			Violence is common in Yemen, where an interim government is 
			grappling with southern secessionists, al Qaeda-linked militants and 
			northern Houthi rebels, as well as severe economic problems 
			inherited from veteran President Ali Abdallah Saleh who was forced 
			out of office in 2011.
 			The insurgents were emboldened by a decline in government control 
			over the country during protests that eventually ousted Saleh. They 
			seized several southern cities before being driven out in 2012.
 			Al Qaeda militants have killed hundreds of Yemeni soldiers and 
			members of the security forces in a series of attacks since an 
			offensive, which the United States has supported with intelligence 
			and drones, drove them out of their strongholds.
 			In July last year, an al Qaeda suicide bomber wearing a Yemeni army 
			uniform killed more than 90 people rehearsing for a military parade 
			in Sanaa. Al Qaeda later claimed responsibility for the attack.
 			Yemen's defense minister, Major General Muhammad Nasir Ahmad, 
			escaped a car bomb on his motorcade in September 2012 that killed at 
			least 12 other people.
 			(Reporting by Mohammad Ghobari; Writing by Maha El Dahan and Sami 
			Aboudi; Editing by Rania El Gamal, Patrick Graham and Sonya 
			Hepinstall)
 			
			
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