An entire wing of Enrique Rébsamen school in Mexico's capital collapsed during the temblor, which struck at 1:15 p.m. local time.
In the video, which was first shown on Univision, a man cries out, "Come! There are kids here, come help!"
He and other rescuers began to frantically dig and eventually they freed a number of children trapped in the rubble.
At least 25 children and teachers were killed as the building fell. The toll from the earthquake is currently over 200 and is expected to rise.
Watch the video, embedded below: