Speculations about anabolic steroids follow death of 21 horses

Twenty one horses from a Venezuelan team competing at the US Open Polo Championship died after they collapsed prior to a match in Florida.

James Belden, the team veterinarian for Lechuza Caracas, said it was unlikely that the horses died because of a tainted medication or anabolic steroids as they are banned in England where the team competes.

From in.reuters.com:

"From the reports I've received, they came out of their trailers and they were dizzy ... and began toppling over," said Terence McElroy, spokesman for the Florida Department of Agriculture. "It's my understanding that all of these horses have died, 21 in total."
McElroy said 15 of the horses had been transported to a state facility in Kissimmee, where necropsies and other tests would be conducted. There was no obvious indication of what had caused the horses to collapse, he said.
The polo club, located in Wellington, about 70 miles (113 km) north of Miami, confirmed in a statement that horses had died but did not cite a number. It said the cause of death had not been determined.

Some believe that the reason behind death of all horses could be the use of anabolic steroids.