The country's electoral commission announces the move just hours before voting was due to begin.
Police said the gunman, who was shot dead, was an employee who had reportedly just been fired.
He insists "walls work" as he confirms his plan to bypass Congress and build on the Mexican border.
Colin Kaepernick and former team-mate Eric Reid reach settlements with the NFL over 'collusion' cases against team owners.
Travis Kauffman was hiking in Colorado when he came toe-to-toe with a young mountain lion.
Shamima Begum's family urge her return to the UK, as she tells of fears her baby will be taken away.
US police detain two Nigerian men, one of whom worked on Jussie Smollett's TV show Empire.
Scientists have called for a ban on the development of weapons controlled by AI.
The minority Socialist-led government lost the support of Catalan MPs over the budget.
Police find the bodes of 66 people, including 22 children and 12 women, killed in villages.
Thirty years after Soviet troops pulled out of Afghanistan, the BBC went to meet the mother of a soldier killed in the disastrous war.
The US general leading the fight against the Islamic State group has warned against withdrawing troops.
Sqn Ldr Dick Churchill was one of 76 airmen who escaped from prisoner of war camp Stalag Luft III.
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