Nacogdoches police think the same person is responsible for two 'grab and run' robberies in 24 hours. The first one happened around 11:30 Sunday night at the 'Tetco Gas Station' on University Drive. The robber took cash from the register. Then At 3:00 Monday morning at the 'North Street Chevron' the robber implied he had a weapon while demanding cash. Nobody was hurt in either case. Investigators tell us they have strong leads in the case.