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The incident happened on Tuesday at a home in Lake Dalecarlia in southern Lake County.
A woman reported that the men were driving a yellow rented van and forced their way into her home.
The men restrained her and ransacked the home, deputies said.
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Anyone with information is asked to call the sheriff's office at 1-800-750-2746.
NIPSCO representatives said they are aware of scammers pretending to be NIPSCO employees.
Residents with questions about people claiming to represent the company should call the utility's customer care team at 1-800-464-772.
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