California law enforcement officials say they’ve made arrests in what they believe to be one of the largest human trafficking cases in the western U.S.

Los Angeles County Sheriff Jim McDonnell and California Attorney General Xavier Becerra are expected to provide details of the probe at a news conference Thursday morning.

Authorities did not provide detailed information about the case.

But they say it involves sex, fraud and theft crimes that spanned across California, Nevada and Texas. 

Investigators say the probe was launched in December 2016 after a missing person report was filed in Tulare County in Central California.
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