Third baseman Troy Glaus and outfielder Chris Duncan were arriving at the ballpark when the explosion occurred at approximately 2 p.m. PT. They were signing autographs near the players' entrance, just a couple of blocks from the under-construction Hilton Hotel where the explosion took place.
Both players said they felt concussion in the air from the blast, as well as a jarringly loud noise.
"It was definitely an explosion," Glaus said.
According to news reports, 13 people were injured, two of them critically.
Matthew Leach is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.