A Walmart in Oldsmar was evacuated Wednesday morning after a gas leak was reported following overnight welding operations, according to Palm Harbor Fire Rescue.Emergency crews responded to the Walmart on Tampa Road and evacuated all employees and customers from the building as a precaution.Officials said fire crews are conducting extensive ventilation operations because of the size of the store. Crews are working to clear the building and ensure conditions are safe before anyone is allowed back inside.Oldsmar Fire EMS Chief Jason Schwabe said crews arrived for a medical call and found "some high carbon monoxide readings" within the store."We're currently working on ventilating the carbon monoxide out of the building," Schwabe said.Schwabe said they believe the carbon monoxide came from the overnight welding.He said no one was hurt, but they did transport two people from the scene.Crews were using airboats to ventilate the Walmart.Authorities are asking people to avoid the immediate area while emergency operations continue.It was not immediately clear how long the store would remain evacuated. ...read more read less