At a glance: Key factors in Afghanistan's tense election

KABUL, Afghanistan (AP) — The Taliban have warned Afghanistan's 9.6 million eligible voters to stay away from polling stations during Saturday's presidential election. It's unclear how many will heed those warnings, but turnout is expected to be depressed as a result.

The last presidential election in 2014 was a bloody affair, and some say attacks may increase this time around as well, with many factions having armed supporters.

President Ashraf Ghani and Chief Executive Abdullah Abdullah — who shared power for five years in a so-called unity government — are the leading contenders in the election.

The ballot will feature all 18 candidates running for the office, but the majority have not campaigned. Most weren't even sure the election would take place until a few weeks ago. That's because the recently scuttled U.S.-Taliban peace talks would have probably cancelled the vote. A few candidates have dropped out of the race and announced their support for Ghani, while others may end up as spoilers for one candidate or another.

Security issues and the confusion of trying to hold an election in a country at war create a delicate situation that could easily explode.

A look at the key factors in Afghanistan's upcoming election:

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CANDIDATES

Ghani is the front-runner, although he's facing accusations of corruption and abuse of power. Abdullah is Ghani's partner in the unity government but his biggest rival on election day. Among the second-tier candidates is Gulbuddin Hekmatyar, a deeply conservative former warlord. Like Ghani, he's also an ethnic Pashtun. That means he, along with other minor Pashtun candidates, could take votes away from the incumbent's base and force a second round of voting.

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A HURRIED CAMPAIGN

The U.S. abruptly ended yearlong peace talks with the Taliban on Sept. 7, three weeks before the scheduled election. A peace deal might have meant an interim government was formed instead, so a number of candidates didn't hold any campaign events. Abdullah and Ghani, who are the favorites to win, have crisscrossed the country, sometimes addressing two and three rallies in a single day in different parts of Afghanistan. Campaigning ended Wednesday.

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ELEIGIBLE VOTERS

According to Afghanistan's Independent Election Commission, there are more than 9.6 million eligible voters. It's unclear how many will come out to vote on Saturday, given security worries and voter apathy due to the country's history of electoral fraud.

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THE PROCESS

To win the election outright, a candidate needs 51% of all votes. If no one gets a majority, the top two candidates will face off in a second vote. Polls open at 7 a.m. and close at 4 p.m. The preliminary results should be ready by Oct. 17, nearly three weeks after the vote. The final tally's announcement is expected on Nov. 7.