Heroic firefighters freed three children from a narrow gap in between walls after they got stuck inside when playing hide and seek in eastern China.

The video, filmed in the city of Ningbo in Zhejiang Province on April 6, shows firemen using a hydraulic spreader to expand the one-metre-wide wall gap and tearing down the bricks.

After fifteen minutes, a seven-year-old was rescued first, followed by a five-year-old boy and a seven-year-old boy.

According to reports, the children were playing hide and seek and walked into the narrow gap between the two walls. However, they realised they were trapped inside when they attempted to walk out.

Fortunately, no one was injured. The video was provided by local fire brigade.