LOUISVILLE, Ky (AP) — Bettors who wagered on Maximum Security in the Kentucky Derby, only to see the colt get disqualified for interference, will receive refunds.

Twinspires.com, Churchill Downs’ online wagering service, tweeted that it will give back up to US$10 to anyone who bet on Maximum Security to win in Saturday’s Derby.

The company said US$6,212,046 was bet on the colt to win. Maximum Security also had US$1,495,408 bet to place and US$1,272,082 wagered to show, so the disqualification cost those bettors about US$9 million.

Country House, a 65-1 shot, was moved up to first place from second. The colt paid US$132.40, US$56.60, and US$24.60.

Twinspires.com says US$520,907 was wagered on Country House to win.

A US$2 exacta wager — involving horses finishing first and second — paid US$3,009.60. A US$1 superfecta bet — involving the first four horses — returned US$51,400.10.

Churchill Downs said wagering on the Kentucky Derby increased 10 per cent to a record US$165.5 million, surpassing the old mark of US$149.9 million set last year. This year’s wagering included US$4.1 million bet in Japan — the first time the Derby was offered for wagering in that country. Master Fencer, the first Japan-bred to run in the Derby, was sixth.

The track said wagering from all sources on the 14-race card totalled a record US$250.9 million, up 11 per cent over last year’s total of US$225.7 million.

The attendance of 150,729 was down 4 per cent compared with last year, with the forecast of all-day rain keeping fans away although the heaviest rain didn’t fall until about an hour before the Derby was run.