POLO HORSES DIE - CNN coverage

(CNN) -- Fourteen thoroughbred horses dropped dead Sunday before a polo match near West Palm Beach, Florida, and a national investigation has been launched to find the cause, officials said.
Blue tarps obstruct the view of horses that died at the International Polo Club in Wellington, Florida.

Blue tarps obstruct the view of horses that died at the International Polo Club in Wellington, Florida.

The South Florida Sun-Sentinel is reporting that as many as 21 horses in total have died between Sunday night and Monday morning.

State and local veterinary teams are trying to figure out what happened at the International Polo Club Palm Beach in Wellington, Florida, as team Lechuza Caracas prepared to compete in a U.S. Open match.

It's unclear what killed the horses but necropsies and blood tests were being done Sunday, the Palm Beach Post reported.

The U.S. Polo Association, the sport's governing body, is expected to open an investigation Monday.

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