Arson investigators are loking into three fires that took place over the course of about five hours in Memphis. All of the fires took place in vacant houses on Saturday. The first fire reported around 2am that day on Lexington Circle on the city’s north side. Then another fire at a vacant home near Henricks and Prescott. The third fire happened in the 1200 block of Easst McLemore. If you know anything about who set those fires, call 528-CASH.