Florida officials say a mineral overdose is the probable cause of death for 21 polo horses that fell ill as they prepared for a championship match earlier this month.

After the death of 21 horses in Florida, the United States Polo Association says it will examine safeguards for polo horses, including developing a prohibited substance policy.

The veterinarian who injected 21 elite polo horses with a supplement before a championship match in Florida and then watched them die says the grief is unbearable.

At the same time polo fans gathered to mourn 21 prized horses that died before a championship match, they learned that a wrongly mixed supplement was likely to blame for their deaths.

Unable to legally bring a supplement into the U.S. to make their horses more resilient, a Venezuelan polo team used another way to get ready for a champion match: Have a pharmacy mix up the concoction.

In an April 22 story about 21 polo horses that died in Florida, The Associated Press reported erroneously that the Food and Drug Administration had refused to approve the French-made supplement Biodyl for use in the U.S. The manufacturer has never submitt

An official at a Florida pharmacy tells The Associated Press that the business incorrectly prepared a supplement for 21 polo horses that died over the weekend before a championship match.

Twenty-one prized polo horses that mysteriously died before one of the sport’s top championships were given a supplement that likely caused their deaths, the leader of the Venezuelan-owned team told an Argentine newspaper.

A member of a Venezuelan-owned polo team says a supplement likely killed 21 horses before a match last weekend in Florida.

Florida authorities have begun a criminal investigation into the deaths of 21 polo horses from a Venezuelan-owned team preparing to play a match over the weekend.