The search for the remains of a three-year-old girl who disappeared more than half a century ago during a day at the beach with her family has resumed.

Cheryl Gene Grimmer was abducted on January 12, 1970, outside a shower block at Fairy Meadow Beach in Wollongong, on the NSW south coast.

She was enjoying a day at the beach with her mother and three brothers.

In the following decades, numerous searches found little to indicate what happened to her.

Now, NSW Police are mounting a fresh search with the assistance of specialist officers after receiving information from a member of the public.

This information led police to bushland in the Wollongong suburb of Balgownie on Thursday afternoon, marking the start of the new search effort.

At the time of Cheryl's kidnapping, witnesses report

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