There’s practically no doubt that arson was the cause of yet another fire in a vacant house here Sunday night.After all, an empty plastic five-gallon fuel jug was found just inside the front door of the burning building.But investigators are not sure if the latest incident is directly connected to a string of similar fires which have hit Lamesa since the first of the year.While Sunday’s fire was similar to the previous ones in some ways, it was different in others.That has officials trying to figure out if the person who ignited the fire at 1409 N. 4th St. is ...