Cristina Aldehuela/AFP/Getty Images One of the first voters casts his ballots for presidential and parliamentary seats on Saturday, February 23, at the Unguwar Sarki polling station in Kaduna, Nigeria. In photos: Nigerians vote in a contentious election

Cristina Aldehuela/AFP/Getty Images One of the first voters casts his ballots for presidential and parliamentary seats on Saturday, February 23, at the Unguwar Sarki polling station in Kaduna, Nigeria.

Nigerians went to the polls Saturday, February 23, to vote in presidential and parliamentary elections. President Muhammadu Buhari, 76, faces more than 70 rivals in a contest that was delayed a week. His main opponent is Atiku Abubakar, 72, a business tycoon and former Nigerian vice president.