? And so forth , '' McElroy said . John Walsh , the Lechuza Caracas polo club president , said he was told that there was no contagious virus airborne or disease and that the incident was an `` isolated '' one . Watch Walsh talk about the devastating deaths '' `` This was a mistake of a combination of something , and whether the mistake was at the barn , whether the mistake was at the feed company , whether the mistake was at the vitamin company , '' Scott Swerdlin of the Palm Beach Equine Clinic , who treated some of the horses , told CNN affiliate WPTV . `` We do n't know , but we 're going to find out . '' James Belden , a veterinarian at the Left Bank Equine Clinic who also treated some of the horses , told WPTV that he and others do n't suspect foul play . `` I think this is an accident , '' he told WPTV . `` A terrible accident . '' McElroy said that despite the early indications , he does not want to jump to conclusions about what happened . `` Obviously , this
-LRB- CNN -RRB- -- State officials said Monday that they suspect a drug reaction or toxins killed 21 horses as they were prepared to compete in a Sunday polo match in Wellington , Florida . Blue tarps obstruct the view of horses that died at the International Polo Club Palm Beach in Florida . State officials and local law enforcement also announced Monday that they are launching investigations into the deaths as scientists work to pinpoint what exactly killed the horses . Officials believe that the `` very rapid onset of sickness and death '' points to toxins or a drug reaction and also allows them to rule out other possibilities . `` At this time , there is no evidence that these horses were affected with an infectious or contagious disease , as there are no other horses affected at this time , '' according to Florida Agriculture and Consumer Services spokesman Terence McElroy . Officials are continuing to conduct tests , and Florida agriculture scientists are performing necropsies on the animals . `` We 'll be testing blood and tissue to see what the common denominator was here : Was it something injected ? Was it bad water