The San Antonio Fire Department is confirming four deaths in an explosion on the far Southeast Side. The blast happened at 11:30 p.m. Friday near K-Bar, a construction company on South Presa Street near the 410 Loop. Fire crews found one person dead at the scene and confirmed three more fatalities by Sunday evening. The Bexar County Medical Examiner has identified one victim as 36-year-old Roger Huron Jr. The SAFD is investigating the cause of the explosion, but arson is suspected.