(CNN) Santa Anita Park in Arcadia, California, will reopen for "limited training" Monday morning, after racing was suspended last week in response to the deaths of 21 racehorses since December 26.

The track, which has been closed since Tuesday, will be "restricted to joggers and gallopers," a statement from the park said, referring to gaits for horses.

"Over the past four days, we've been able to do a great deal in terms of amending the soil and inspecting it," Dennis Moore, who was retained as a consultant to inspect the condition of the one-mile track, said in the park's statement.

Nobody knows why 21 horses died while racing or training at the track in 10 weeks. Only 10 horse deaths occurred during the same period last season.

The company that runs Santa Anita Park announced new safety measures Friday in response to the deaths.

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