WASHINGTON (Reuters) - Some 15 per cent of Americans who cast a ballot on Tuesday (Nov 8) said it was their first time voting in a presidential election, according to an early reading from the Reuters/Ipsos national Election Day poll, up from 9 per cent of voters who said so in 2012.

The poll of nearly 35,000 people also showed that 13 per cent of voters had waited until the final week of the presidential race to make up their mind between the candidates, who include Democrat Hillary Clinton and Republican Donald Trump, up from 9 per cent who said so in 2012.

The Federal Bureau of Investigation announced in late October that it was looking at more e-mails connected to its investigation of Mrs Clinton's use of a personal e-mail server while secretary of state.

FBI director James Comey later said that the new trove of e-mails did not affect his earlier decision to not bring a criminal case against Mrs Clinton.