Maui police are investigating the cause of a fire that caused at least $350,000 in damage to a Maui fitness center on Wednesday night. An employee at the Valley Isle Fitness center reported the fire at about 6:30 p.m. on the bottom floor of the two-story unit. Workers and clients at the center were able to leave the building unharmed. No injuries were reported. Maui firefighters are still working to determine the cause of the fire.