Vets Ponder What Killed 21 Ponies at U.S. Open Polo Championship
Daily News (21 April 09)
Army: 3 Vials of Virus Samples Missing From Maryland Facility
CNN.com/US (22 April 09)
Scrutiny in Horse Deaths Falls on Vitamins
CNN.com/US (22 April 09)
Criminal Probe of Death of 21 Polo Ponies Opened