The San Francisco Giants apologized to Baltimore Orioles outfielder Adam Jones a day after someone in the AT&T Park stands threw a banana at him during Sunday's game.
Jones tweeted Sunday that the possibly racially-motivated incident occurred in the ninth inning of the Orioles' 10-2 victory over the Giants while he was playing center field.
Jones, who is African American, homered and drove in four runs on Sunday.
The Giants wrote in a statement Monday that they "would like to extend our sincerest apologies to Adam and the entire Orioles organization."
The Giants said they reviewed security video but were not been able to identify the person responsible for the act, which can be considered a racial insult.
Staci Slaughter, the Giants' senior vice president of communications, told USA Today the team found out about the incident after Jones tweeted about it.
"I wish the incident could've been reported to us sooner just so we could have tried to address it right away," she said. "Our fans are generally very well behaved, but when we catch somebody doing something like that, we have zero tolerance and we immediately eject them."
Sunday, Jones tweeted: "I want to thank whatever slapd--- threw that banana towards my direction in CF in the last inning. Way to show ur class u jacka--."
Jones later tweeted in response to those who defended the incident.
"I love how some ppl are defending the actions by someone today. Shows how u really are also. All good wit me. I just #StayHungry," he wrote.
He then wrote that he may give up on social media.
Similar incidents have occurred in recent years at NHL games and European soccer matches.
In 2011, Philadelphia Flyers forward Wayne Simmonds had a banana thrown in his direction while on the ice during an exhibition game in his native Ontario.
Black soccer players in Europe have also had bananas thrown at them during games. One high-profile incident involved Brazilian star Roberto Carlos while playing a game in Russia.