NASHVILLE, Tenn. (WKRN) — Firefighters were called to a blaze Thursday morning in Madison.

According to officials, the call came in just after 6:40 a.m. at 1225 Gallatin Pike. The Nashville Fire Department (NFD) told News 2 crews found a small storage unit on fire upon arrival.

(Courtesy: Nashville Fire Department)

NFD said about 40 percent of the unit that stored desks and chairs was damaged.

It is still unclear how the fire started. The investigation is ongoing.

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This is a developing story. WKRN News 2 will continue to update this article as new information becomes available.