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 Jersey City mother was arrested Friday after leaving her 22-month-old son alone in the car in a department store parking lot, police said.

The 43-year-old woman was charged with endangering the welfare of a child following the 2 p.m. incident at the Mill Creek mall T.J. Maxx, Secaucus police Capt. Dennis Miller said. 

Police who were in the area on a separate call spotted the unattended toddler in the locked BMW and knocked on the window. The boy did not respond, prompting police to prepare to make a forced entry, Miller said.