More than a dozen registered sex offenders in Wisconsin are unaccounted for after they tampered with or removed their GPS monitoring devices, officials said.

Wisconsin’s Department of Corrections made the startling revelation in response to WMTV’s inquiry about Brandon King, 31. King’s accused of removing his tracking device hours after his August 6 release from a Washington County prison—where he served time for incest and forcing a child to watch sexually-explicit material.

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The Milwaukee Journal Sentinel reported that King was living at a transitional housing facility in Jackson at the time of his disappearance. Though he’s on the sex offender registry for life, King was to be on extended supervision until 2028.

The state agency reportedly has 965 sex offenders on active supervision. WMTV reported that arrest warrants have been issued for the missing 13 offenders.

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[Featured image: Brandon King/Wisconsin Department of Corrections]