A photo showing a group of Indian schoolgirls forming a human chain to pull a broken-down bus has gone viral on social media, with users calling it a testament to the strength of girl power.

The schoolgirls, from Manipur in north-east India, were on a school trip when their bus broke down on a steep, muddy hillside.

In the photos, dozens of girls can be seen dragging the bus up the narrow path using a giant rope.