This footage shows a crying mother holding her unconscious son who is fighting for his life after being struck by a metal valve which fell from 21 storeys onto his head.
The boy, aged three years and 10 months, was walking home from nursery school with his mother, Zhong Lingfang, when the incident happened in the city of Dongyang in East China's Zhejiang Province on Thursday.
Ms Zhong, who lives in the Zijing Zhuangyuan Residential District, said: 'One second he was eating a banana and holding my hand, and the next he collapsed on the ground. 'He wasn't crying and made no sound. His head was covered in blood.'
According to the police, the boy, whose family name is Ouyang, was struck on the head by a metal angle valve weighing roughly 3lb.
The authorities arrested a renovation worker surnamed Zu, 29, who told investigators he accidentally knocked the valve off an air-conditioning unit he was soldering on the twenty first floor.