Fire investigators are looking into what sparked a fire at an abandoned four-plex in northwest Albuquerque. According to Albuquerque Fire Rescue officials, crews were called to the complex at 63rd and Avalon around 2:30 a.m. Friday with reports that there was a trapped victim inside. Firefighters arrived to see smoke and flames coming from the apartment. Crews got the fire under control and made entry to find a victim deceased. Investigators are now working to determine how the fire started and get more information on the victim.