Updated at 9:05 p.m. ET
In a stunning and historic Kentucky Derby upset, the horse that crossed the finish line first was not the one that was declared the winner.
Maximum Security, the favorite entering the race and the only undefeated horse in the field, outpaced the competition on the muddy track at Churchill Downs and appeared to have won the 145th Kentucky Derby with a time of 2:03.93.
Then an objection was lodged. For several tense minutes in Louisville, some 150,000 people in rain-soaked ponchos and fancy hats waited for a verdict.