A commercial building with storage units and businesses on Northfield Road burned completely to the ground on Saturday morning, according to the Watertown Fire Department.

Fire crews got to the scene around 6:37 a.m. and found the building completely engulfed in flames. It took firefighters from both Watertown and Bethlehem about 40 minutes to get it under control.

Officials said the damage was extensive, destroying everything inside the building, including personal belongings in the storage units.

No injuries were reported.

Local and state fire marshals will be handling the investigation.