REVERE – Fire officials are still investigating the cause of a three-alarm blaze that destroyed the Suffolk Downs track kitchen Tuesday evening.”It’s still undetermined and under investigation,” Revere Deputy Chief Anthony Giampietro said Wednesday afternoon.A firefighter on duty at the track called in a fire at 5:36 p.m. Tuesday, and the second and third alarms sounded soon thereafter as flames engulfed the track kitchen in the racetrack stable area.No persons or animals were injured as workers moved horses away from the blaze. The building – which included the kitchen and a small dining area – was completely destroyed, however.Racetrack officials said Tuesday that, despite the fire, the season should start Saturday as planned.Revere Mayor Daniel Rizzo also told The Daily Item the fire will have no impact on the bid by Mohegan Sun to build a resort casino on the site. The building and surrounding stables would be razed for the casino anyway, Rizzo said.