President Barack Obama and Republican challenger Mitt Romney are locked in a tight race for the White House, with three critical battleground states on a knife edge as results from the US election come in.
2:24pm: In Ohio: 57 per cent of the vote counted, Obama leads 50-48 per cent.
2:18pm: It's looking increasingly difficult for Romney: Antony Green says if Obama wins either Virginia, North Carolina or Florida it's all over and the Democrats have won.
Follow our live blog for updates.
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