On Saturday, Afghans will head to the polls to choose a new president from the two contestants left in the race, Ashraf Ghani and Abdullah Abdullah. Sharon Behn reports from Kabul that security is tight and the race is too close to call.
Afghanistan Readies for Presidential Run-off

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Afghan police and soldiers guard checkpoints at almost every intersection, searching vehicles and frisking drivers in a massive security operation ahead of elections, Kabul, June 13, 2014.

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With fears for violence high during the presidential election, Afghanistan National Army soldiers stand alert, in Herat, west of Kabul, Afghanistan, June 13, 2014.

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A female police officer, in blue burqa, searches female passengers at a checkpoint in Kandahar, south of Kabul, Afghanistan, June 13, 2014.

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Presidential candidate Ashraf Ghani Ahmadzai speaks during his last campaign rally in Kabul, Afghanistan, June 11, 2014.