There are worrying scenes in the city and Leigh Wood produced a knockout of Michael Conlan in the last round to retain his title.
The powerful punch sent Conlan through the ropes and onto the floor and he was taken to the hospital on a stretcher.
The promoter said the fighter was conscious and talking.
Wood was knocked down in the first round and was losing before the knockout.
Wood, who stopped his celebrations to allow his opponent to receive immediate medical treatment, told Dazn: "I just hope Michael is all right; I can't celebrate until I know he is."
He is a tough guy and it was a bad knockout, so I want to see him well.
Wood's win was one of the greatest comebacks, but Hearn said they were all praying for Michael.
It looked like Michael was going to win and I didn't think he could turn the fight around.
Michael was two up going into the last round, but he was knocked out by Leigh in the 12th.
I would love to celebrate but our thoughts are with Michael.
Wood, who was in tears at the post-fight news conference, said that there had been some tears.
I heard he is up and talking, but I would like to see him.
Wood won the regular version of the title with a points win over China's Xu Can in July at Matchroom's Fight Camp.
10 years ago, Wood was set to fight at this venue on the undercard of Carl Froch's IBF super-middleweight world championship fight against Lucian Bute.
However, Wood, who was in the crowd that day cheering on his fellowNottingham boxer as he beat Bute with a fifth-round knockout, called the opportunity to fight in front of a crowd of just under 10,000 people at the Motorpoint Arena a fairy tale.
He was caught late in the first round by a powerful overhand left, which almost ended his hopes inside the first three minutes.
Conlan had a decorated amateur career that included an Olympic bronze medal and gold medals in both the World and European Amateur Championships, and he was fighting for a world title in his 17th professional fight.
Wood showed great character and desire in his fight with the other man.
Wood gradually started to work his way back into the fight, aided by some great shots to Conlan's body before the away fighter was judged to have been knocked down in the 11th despite arguments from his corner.
It ended in dramatic circumstances after 25 seconds. Wood hit Conlan with a glancing blow. Wood landed the knockout blow as Conlan dropped his arms.
Mark Magsayo of the Philippines won the WBC title after defeating Gary Russell Jr with a majority points decision in January.
Wood will be very interested to watch the fight for the IBF title as Spanish title holder Kiko Martinez takes on England's Josh Warrington in the home city of Warrington on 26 March.
A stadium fight could be set up at Elland Road or the City Ground.
It has been his dream for a long time for Leigh Wood to fight at the City Ground.
His professional record is 11 wins from 11 contests.
He was never in trouble against Juan Carlos Rubio, who was brave to reach the final bell.
Two judges gave Agyarko every round, and the third judge called it 98-92, as the boxer kept his title.
After stepping up to lightweight with a wide points win over Argentina's Yamila Belen Abellaneda, the former women's super-featherweight world champion got back to her old ways.
The loss to Alycia Baumgardner in November made her relinquish the title she had held since July.
In the third round,Harper had a cut over her left eye.
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Gary Cully continued his perfect record with his 14th professional win, as he knocked out Miguel Vasquez in five rounds after putting him down in the third.