SANAA, Yemen — Dozens of militants battled their way out of prison Wednesday in the latest sign that Yemen's political upheaval has emboldened them to challenge authorities in the country's nearly lawless south, security officials said.
In a carefully choreographed escape from the Mukalla prison in Hadramout province, 57 al-Qaida-linked militants attacked their guards and seized their weapons before they made their way through a 45-yard tunnel to freedom.Interactive: Al-Qaida timeline (on this page)
Simultaneously, bands of gunmen opened fire at the prison from outside to divert the guards' attention, the officials said.
"The militants opened fire on the prison gates and exchanged fire with the guards, injuring two and killing one," a security official told Reuters.
The 57 were among 62 inmates who escaped. It was not immediately clear whether the other six were also Islamist militants.
All the prisoners were Yemeni and some of them had been jailed after returning from Iraq where they fought in militant ranks, an official said.
Slideshow: Yemen in the spotlight (on this page)
Authorities said many of the inmates who escaped belonged to a cell blamed for a series of attacks on security forces in the last two years. Their leader, Hamza al-Qehety, was believed to be among those who escaped on Wednesday.
The U.S. and ally Saudi Arabia fear that a power vacuum and tribal warfare in Yemen will be exploited by the local wing of al-Qaida to launch attacks in the region and beyond.
The last major prison breakout by al-Qaida militants in Yemen took place in 2006, when 23 escaped a Sanaa detention facility. Among them was Nasser al-Wahishi, who went on to become the leader of al-Qaida in Yemen, as well as Qassim al-Rimi, a dominant figure in the group.
Al-Qaida's branch in Yemen has been linked to several nearly successful attacks on U.S. targets, including the plot to bomb a Detroit-bound airliner in December 2009. The group also put sophisticated bombs into U.S.-addressed parcels that made it onto cargo flights last year.Slideshow: Political unrest in Yemen (on this page)
Al-Qaida-linked militants seized control last month of two towns in Abyan, another southern province, and briefly took control of several neighborhoods in the neighboring province of Lahj last week.
Some of these militants belong to groups that have been quietly tolerated by longtime ruler Ali Abdullah Saleh and used to counter the weight of other extremists or against secessionists in the mostly secular south of the country.
Yemen's political crisis began when demonstrators inspired by successful uprisings in Egypt and Tunisia took to the streets in early February to demand Saleh's ouster. The largely peaceful movement gave way to heavy street fighting when tribal militias took up arms in late May.
Saleh, Yemen's president of nearly 33 years, was badly wounded in an attack on his Sanaa compound earlier this month and is undergoing medical treatment in Saudi Arabia. The head of Yemen's most powerful tribal confederation warned Tuesday in a letter to the Saudi king that Yemen could plunge into civil war if Saleh is allowed to return home.Video: Attack on president puts Yemen step closer to civil war (on this page)
Vice President Abed Rabbo Mansour Hadi became acting president after Saleh's departure. The opposition has accused Saleh's inner circle and family of hindering the opposition's dialogue with Hadi.
Saleh has exasperated his rich Gulf Arab neighbors by three times agreeing to step down, only to pull out of a transition plan at the last minute and cling on to power.
An aide to Saleh said on Wednesday his health was on the mend and that he had been receiving guests and giving instructions on day-to-day affairs in Yemen.
Meanwhile, A senior U.S. official pressed the Yemeni government on Wednesday to implement a Gulf Arab initiative calling for Saleh to step down, Yemeni officials said. A Yemeni government source said Jeffrey Feltman, the U.S. Assistant Secretary for Near Eastern Affairs, met Foreign Minister Abubakr al-Qirbi and Hadi.
The Associated Press and Reuters contributed to this report.