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A man who allegedly randomly attacked a toddler in China's Shaanxi province has been arrested, state media report.

Security camera footage of a man repeatedly stamping on the two-year-old on a pavement in Luochuan County has sparked outrage in China.

It became the most talked-about topic on social media, with many criticising people who passed by without helping.

The child suffered skull fractures but was not in a life-threatening condition, said Xinhua news agency.

The 28-year-old man, surnamed Wang, is believed to have mental health problems, said Xinhua. He was detained late on Thursday.

The video showed the child playing outside a restaurant when a man walks by and suddenly knocks him to the ground.

The man then stamped on the child's head repeatedly. He also used a broom to beat him for at least 30 seconds.