Zhang, 35, was cleaning the escalator on Saturday at the Longemont shopping mall in Shanghai's Changning district, the People's Daily reported. [Chinese woman gets trapped inside escalator, but saves 2-year-old son]
The comb plate on the escalator suddenly collapsed and trapped his left shin. His mop was also dragged into the cracks.
"The escalator has been closed and the case is under investigation," Shanghai authorities said on Sunday.