The situation was reported just before 6 p.m. Tuesday near the Upper Pond section of Grace Lord Park.
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Authorities say they were notified that a 6-year-old child was calling for his mother and when police searched the area, they found footprints going into the water.
That is where they found a 35-year-old woman and an 11-year-old boy dead in the water.
Authorities say there is not cause for concern and it appears to be an isolated incident.
It was not clear if the 11-year-old boy was also the woman's son.
As authorities towed a Nissan SUV from the scene, local residents said drownings do happen there occasionally, but a winter-time drowning is especially shocking.
"It's obviously a very sad day when children are involved in this type of situation, horrible situation, our deepest condolences go out to the family," said acting Morris County Prosecutor Robert Carroll.
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The identities of the victims have not yet been released.
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