A man in Fengshan county, Guangxi Zhuang autonomous region, is being probed for allegedly maltreating his 92-year-old mother by locking her up in a tiny room.

A video has gone viral on Chinese social media showing how the old woman, surnamed Yang, lived in a room measuring less than 10 square meters and containing only a wooden board covered by an old quilt for her to sleep on.

The video, believed to have been recorded by local media, showed that an iron gate outside the room was locked.