(CNN) A Maryland woman has been charged after officers responded to a 911 call to find seven children trapped inside a hot car.

The oldest child in the car, a 4-year-old, called police to report they had been left unattended, but said he didn't know where they were.

"Through GPS and other mechanisms, the call-taker was able to pinpoint the location of the vehicle," the Charles County Sheriff's Office said in a statement.

When officers arrived, they found the car turned off and its windows rolled up.

The youngest child in the car was 2 years old.

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