Markets nervous as US presidential race gets tighter

Markets are showing nerves as the US presidential race tightens heading into the final straight.

Asian shares slumped overnight and the US dollar came under new pressure.

The S&P 500 share index in New York touched four month lows last night.

Wall Street's 'Vix index' - a measure which charts expected market volatility - has returned to highs seen when the UK voted to leave the EU. This metric is nicknamed the 'fear gauge.'

Haven assets like gold are on the rise - while the Mexican peso is losing value.