A Greenlawn woman was arrested Thursday for leaving her 21-month-old child unattended in a vehicle at the Tanger Outlets in Deer Park, police say.

A security guard notified police after a person reported a child left in a car seat in a Nissan Rogue around 11:15 a.m.

The mother of the child, Yesenia Pinilla, returned to her vehicle and was arrested by police.

The boy was left alone for approximately 20 minutes while the vehicle was running.

Child Protective Services was notified. The boy was unharmed and released to his father.

Pinilla, 36, was charged with endangering the welfare of a child. She will held overnight at the Fourth Precinct and will be arraigned on Friday.