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Nikitin's victory over Conlan (right) came in for widespread criticism

The International Boxing Association (Aiba) has dropped a number of officials after a review of their decisions at the Olympics.

Aiba said that, after 239 bouts in Rio, "less than a handful of the decisions were not at the level expected".

The body has admitted it is in a "transition process", but said results of bouts already contested will stand.

The reaction to Irish fighter Michael Conlan's controversial defeat prompted action from Aiba.

Conlan lost by unanimous decision to Russia's Vladimir Nikitin when many observers felt he had won comfortably.

"We have a lot of educating to do and a lot of evaluating to do," Aiba official Tom Virgets told the BBC.

"Along the way we have to sharpen the blade with our officials, with more training, more evaluation."

The federation has since confirmed: "The concerned referees and judges will no longer officiate at the Rio 2016 Olympic Games."

Injured Nikitin has since pulled out of his semi-final bout, citing injury, but nonetheless will return to Russia with a bronze medal.

Michael Conlan reacts on Twitter to the decision to send judges home from Rio

New rules for Rio

Aiba, which governs amateur boxing, has changed several rules for the Rio Games - allowing professionals to compete, removing the headguard, scrapping the appeals process and changing the scoring system.

Five officials judge each bout and a computer randomly selects three whose scores are counted.

Traditionally, judges would use a computer scoring system to count each punch.

But now the winner of each round is awarded 10 points and the loser a lower number, based on a criteria which includes the quality of punches landed, effective aggression and tactical superiority.

"We're getting better but Rome ain't built in a day and we're going to continue to raise that bar of excellence," insisted Virgets, a member of Aiba's executive board and chairman of its disciplinary committee.

Asked about the judges in Rio, Virgets said: "We're changing them from being robots who press the button to being analysts of the bout."

Michael Conlan makes his feelings clear after his controversial defeat

There was also controversy when Russian world champion Evgeny Tishchenko was awarded all three rounds in his favour against Kazakhstan's Vassiliy Levit in the men's heavyweight final, despite a cut to his head and spending much of the bout on the back foot.

Tishchenko was booed by the crowd after being given the unanimous points decision.

Irish official Michael Gallagher was one of the judges in the heavyweight final.

An enraged Conlan said after his defeat: "I came for gold and I've been cheated. I'll not do another Olympics. I would advise anybody not to compete for Aiba."

Virgets said of his reaction: "I can understand that frustration is heightened when there is a significant amount of media who also believe that he should have won.

"We will continue to evaluate to where the media is educated, the coaches are educated as to the criteria better and the officials are constantly getting better so that hopefully we will come to an Olympics in the future and 100% of the bouts will be accepted by coaches, media, athletes and officials."

Conlan's defeat prompted a five-year-old boy from Dublin to offer him his school medal as a consolation "because you are a winner".