SAN MARCOS, Texas – Police in San Marcos are looking for a person who robbed a Sunoco gas station on Highway 80, officers said Wednesday. Just before 12:30 a.m., the person entered the Sunoco store holding what appeared to be a stainless-steel lug wrench, according to San Marcos investigators. (Provided by San Marcos authorities)At this point, a second clerk walked from the back of the store toward the counter. The robber noticed the clerk and approached him, “wielding the lug wrench in a threatening manner,” police said. The person arrived and departed the Sunoco parking lot on foot, and took off southbound along River Road in the direction of Bugg Lane, according to authorities.