Yemenis will be soon voting for a successor to President Ali Abdullah Saleh in an election with Vice President Abd-Rabbu Mansour Hadi as the only candidate.

On the eve of Tuesday's polling, violence flared in the south, where separatists seek a divorce from the north with which they fought a civil war in 1994 after formal political union. Officials warned attacks to disrupt polling were all but certain.

An explosion rocked a polling station in the southern city of Aden on Monday. One soldier was killed and another injured as gunfire broke out after the blast, an official told Reuters news agency.

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Witnesses said government troops and armed separatists exchanged fire in the Mansoura neighbourhood of Aden, a stronghold of the Southern Movement, which has called on its supporters to boycott the election.

The vote has also been denounced by youth activists who took to the streets to demand the end of Saleh's 33-year rule, and regard the transfer plan as a pact among an elite they regard as partners to the crimes of Saleh's tenure, including the killings of protesters in the uprising against him.

A security official said police had carried out "arrest raids on armed hardliners" from the Southern Movement trying "by force to prevent citizens from participating in the elections."

"These elements are trying to create a state of fear among citizens by spreading rumours that February 21 [election day] will see acts of violence," the official told the AFP news agency.

Increasing attacks

Attacks against electoral offices and polling stations have increased in recent days.

On Sunday night, a rocket-propelled grenade was fired at an election base in the Khour Maksar neighbourhood of Aden, a security official told AFP, adding that there were no casualties.

Three soldiers were also wounded in a clash with southern separatists near a polling booth in the southern Lahij province in the same day.

The vote would make Saleh, now in the United States for further treatment of burns suffered in a June assassination attempt, the fourth Arab autocrat to leave office in a year after revolts in Tunisia, Egypt and Libya.

 "The election is a political scenario mapped out in the GCC initiative but in its essence it is irrelevant to the true ideals of democracy."

Rana Jarhoum, 
a development worker

It leaves unresolved a military standoff between Saleh's relatives, a mutinous general and gunmen loyal to tribal notables. There is an armed revolt in the north of the country and Islamists accused of links to al-Qaeda have made advances in the south.

"The election is a political scenario mapped out in the GCC initiative but in its essence it is irrelevant to the true ideals of democracy," Rana Jarhoum, 29, a development worker, said.

Vice President Abd-Rabbu Mansour Hadi, a 66-year-old career soldier, was Saleh’s vice-president since 1994. In practice he replaced Saleh last June when the 69-year-old president was wounded in the assassination attempt and had to spend more than three months receiving treatment in Saudi Arabia.

Abdullah al-Faqih, a Sanaa-based analyst, said the biggest challenge for Hadi will be to take control of the country's security forces, which remain under the control of Saleh's sons and nephews.

"People are worried about the rule of the military and security institutions in the future," al-Faqih told Al Jazeera.

"They watch closely what happened in Egypt and they are afraid that Hadi will be ruled by the military and not rule the military ... The first challenge is to rebuild the military or at least to remove the leaders so that he can really  exercise power in the country."

Transition deal

Tuesday's vote is the result of a power-transition deal brokered by Yemen’s Gulf neighbours in November after months of protests calling for Saleh’s removal.

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The Gulf-brokered deal gave Saleh and his closest aides immunity from prosecution and made him honorary president.

It also stipulated that Hadi become the next president of Yemen for an interim two-year period.

Nobel peace laureate Tawakkul Karman, an active figure in the uprising, has put her backing behind Hadi, whose image has gone up across the Yemeni capital Sanaa, and said his election would be “the fruit of the popular youth uprising.”

US President Barack Obama on Sunday also voiced support for Hadi.

The one-year uprising has brought much of Yemen to the brink of a major crisis, as analysts fear a civil war  if the political situation is not resolved.

The country faces rebellions in both the north and the south, with an al-Qaeda offshoot also responsible for recent attacks in the country.

"If the new government fails to fulfil its obligations to reach out and re-integrate the southerners, the Houthis (northerners) and the youth ... then conflict will be inevitable," political analyst Abdulghani al-Iryani told the Reuters. 

Source: Al Jazeera and agencies