A Saturday morning fire in an apartment on the 2800 block of Crossridge Drive, on the city’s far south side near the border with Mount Pleasant, is under investigation by the Racine Fire Department. Firefighters and the Racine Police Department responded to a second-floor apartment at about 8:12 a.m. Saturday, where a closet had caught fire, causing heat and smoke damage throughout the unit, according to a press release. The fire was extinguished quickly, Fire Department officials said, and no injuries were reported — although an exterior rescue was required to evacuate residents from units on the first and second floors of the building.