Many of the UK’s biggest betting sites went bankrupt after the Grand National.

Bet365, SkyBet, Ladbrokes and William Hill users have all reported issues with their websites.

Visitors saw error messages or pages that failed to load when they viewed the site after the race.

The breakdowns come on one of the biggest betting days of the year. Some websites are now back online, with William Hill working at 7 p.m. on Saturdays.

Bet365 was still showing error messages at the time, with users reporting on social media that they were unable to log into their account as they attempted to cash out winnings.

Others shared a screenshot of a message saying Bet365 was “currently unavailable”. The company’s Twitter account reassured users that it was being reviewed.

A Bet365 spokesperson said The Independent Saturday evening: “Due to unprecedented levels of traffic to the Bet365 site, we are currently experiencing issues which have prevented customers from accessing their account.

“We are aiming to have the site back up and running at full capacity as soon as possible.”

The Bet365 spokesperson apologized to all customers who had been affected by the disruption and asked them to “support us at this time”.

People trying to place bets with William Hill had also reported issues using the app earlier on Saturday. A Twitter user said he was unable to bet on a football match and shared a screenshot showing he was placed in a queue with an estimated wait time 15 minutes due to “high demand”.

SkyBet, Labrokes, William Hill and Bet365 all saw a spike in reported outages after the Grand National, according to website tracker DownDetector.

William Hill, Ladbrokes and SkyBet have been approached for comment.

Saturday’s Randox Grand National was won by Noble Yeats, who was sent off 50-1.