Firefighters have doused a fire that prompted a three-alarm response near Midtown Sacramento early Thursday morning. The scene was at a vacant building near S and 15th streets. Sacramento Fire says their crews responded just after 4 a.m. Three-alarms were called as firefighters initially found it difficult to get to the flames due to a partition in the building. Eventually, firefighters had to go in through the roof. The fire is now out. There were initial reports of someone possibly being inside, firefighters say, but a search of the building came up empty.