text:  Officials stressing shark attacks are rare, but saying that the risk can be reduced by swimming in groups near a lifeguard and avoiding swimming near piers. Tough news for the Team USA Gymnastics team. Three front runners to join Simone Biles and Paris have suffered injuries at the U.S. Olympic trials. Kayla DeCello carried off the mat at an awkward landing on the vault. Shalise Jones seeming to hurt her knee during warm-up on the vault. And Skye Blakely pulling out of the trials on Thursday after an Achilles injury.