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Rescuers continue to frantically dig through the rubble of a collapsed school in Mexico City a day after a 7.1 magnitude earthquake struck, killing hundreds.

ABC News reported, neighbors, police, soldiers and firefighters alike could be seen forming an assembly line tirelessly clawing through the cinderblock and rebar that once made up a wing of the Enrique Rebsamen primary and secondary schools. They, along with anxious parents, are holding out hopes after some families said they received text messages from relatives trapped beneath the debris, according to The Associated Press.

According to the source, so far, the bodies of 21 children and four adults have been discovered at the site, Mexico's Education Minister Aurelio Nuno said. Eleven people have been rescued, and three people are still missing -- two children and a teacher.

On Wednesday evening, first responders continued an eight-hour effort to rescue a student named Frida Sofia, Mexico's education minister told Televisa.

Rescuers managed to contact Sofia as well as give her water and oxygen, the education minister said. She is trapped under a granite table or desk, rescuers believe is giving her some protection from the rubble. Sofia informed workers that there are two people trapped with her. Sofia said she can feel the others but doesn't know whether they are alive.

Young students were seen being pulled out of the rubble in dramatic video posted to social media.