A man is being questioned by police over an alleged assault after a video emerged online of an Aintree racegoer appearing to deliberately knock an elderly man to the ground.
Officers investigating the video, believed to have been taken outside the racecourse said the victim had suffered injuries to his face and they were now speaking to a man who had come forward.
We are aware of the Aintree YouTube video and enquiries are currently being made. Thank you for your concerns
The incident was captured on a mobile phone by a friend of the suited racegoer.
In the video, onlookers can be heard gasping in shock and seen rushing to the man's aid before calling for an ambulance.
A Merseyside Police spokesman said: "The incident is being treated as assault and officers are speaking to several people believed to have further information that could help the investigation."
Many Clouds has won the Grand National at Aintree for trainer Oliver Sherwood and last year's winning jockey Leighton Aspell.
Successful aboard Pineau De Re 12 months ago, Aspell was never too far off the pace and Many Clouds, winner of the Hennessy Gold Cup at Newbury earlier in the season and sixth in the Cheltenham Gold Cup, jumped with aplomb throughout.
For a long way it appeared Shutthefrontdoor could provide Tony McCoy with a fairytale second National triumph before his retirement, but he eventually weakened into fifth place.
Many Clouds tired from the elbow, but had enough in the tank to hold off Saint Are, with Monbeg Dude third and Alvarado fourth.
Many Clouds has won the Grand National at Aintree.
The Winners Bar at Aintree has been renamed in jockey AP McCoy's honour ahead of this afternoon's race.
McCoy, who will be riding favourite Shutthefrontdoor, has said he will retire if he wins on a record 20th appearance in the race.
Liverpool manager Brendan Rodgers sounds like a man who knows his way around a racehorse. If you fancy him as a tipster for the Grand National, he's all over Portrait King.
Brian O'Connell will replace the injured Robbie McNamara aboard Lord Windermere in the Grand National at Aintree on Saturday.
The jockey steps in for the ride aboard the 2014 Cheltenham Gold Cup winner after McNamara sustained chest, abdominal and spinal injuries from a fall at Wexford on Friday.
O'Connell has previously ridden Tharawaat to finish eighth and last year was on board Quito De La Roque, who pulled up at the 21st fence.
A protestor hung a "Horse Racing: You bet, they die" banner on the ‘Gift Horse’, in London's Trafalgar Square, ahead of the Grand National.Read the full story ›
Betting firm Ladbrokes has said today's Grand National race could be the worst ever for bookies as the nation gets behind champion jockey AP McCoy.
"A win for McCoy is our nightmare scenario", David Williams of Ladbrokes said.
Shutthefrontdoor could easily be the best backed horse we've ever known in the Grand National.We're scared even to think about it.
More often than not Aintree throws up a host of stories but this year there's only one show in town. The entire race revolves around one man and one horse.
We reckon it will cost the industry £30 million if McCoy wins but that could be conservative.
The 19-time champion jump jockey AP McCoy appears in his final Grand National before his planned end-of-season retirement.
The Northern Irish jockey is 'very likely' to ride bookmakers' favourite Shutthefrontdoor as he goes in search of a second Aintree victory following his 2010 win with Don't Push It. McCoy is set to end his horse racing career at Sandown Park 25 April, but success in the National may lead the 40-year-old into early retirement.
The biggest betting day for UK horse racing has arrived as the world's most famous steeplechase race kicks off with 40 runners and riders racing over the four-mile, four-furlong (7.2km) course.
The Grand National takes places at Aintree Racecourse near Liverpool. Possible runners include last year's winner Pineau De Re and 2014 runner-up Balthazar King, while Cheltenham Gold Cup winner Lord Windermere could become the first horse since Red Rum in 1975 to win the Gold Cup-National double