A car on the Mexicali-Tijuana highway passes over a crack made by a 7.2-magnitude earthquake which struck the region on April 4. Guillermo Arias/AP
Damage after an earthquake in Mexicali, Mexico, is seen on Sunday, April 4. Jorge Rivera/AP
On April 5, a store assistant hands back change through a broken window at a store after an earthquake in Mexicali. Jorge Duenes/Reuters
Shattered windows litter the sidewalk in downtown Calexico, Calif., following a 7.2-magnitude earthquake on Sunday. Fred Greaves/Reuters
Bricks and rubble from an earthquake in Calexico, Calif., cover the sidewalk on April 4. Denis Poroy/AP
Men stand next to cracks on a street in Mexicali, Mexico, on April 5 a day after a powerful earthquake struck the region. Guillermo Arias/AP
A man sleeps in the back of his pick-up truck, fearing aftershocks, at a parking lot in Mexicali on April 5. Roads were torn up, buildings cracked, and electricity posts toppled after a 7.2-magnitude earthquake shook cities in northern Mexico and southern California, but few casualties were reported. Mexican civil protection officials said at least one man died in a collapsed house and about 100 more were injured in Sunday's quake. Jorge Duenes/Reuters
A Calexico police officer and a US border patrol agent inspect damage to a building in Calexico, Calif., on April 4, following a 7.2- magnitude earthquake. Fred Greaves/Reuters
People walk past broken storefronts in downtown Calexico, Calif., after a 7.2-magnitude earthquake on April 4. Denis Poroy/AP
A US Border Patrol vehicle blocks off Second St. in downtown Calexico, Calif., after an earthquake struck the region in the afternoon on April 4. Denis Poroy/AP
In a country steeped in a history of coups, bloodshed caused by politics, ethnicity, land disputes and, lately, the Boko Haram Islamic uprising, the election is important as Africa's most populous nation consolidates its democracy.
ByMichelle Faul, Associated Press
Nigeria's President Goodluck Jonathan urged his nation to vote peacefully and accept the results of Saturday's presidential elections, which analysts say will be the most tightly contested in the history of Africa's richest nation and its largest democracy.