NASHVILLE, Tenn. (CLARKSVILLENOW) – Hundreds of sex offenders got unannounced visits over the weekend from officers with the Tennessee Department of Corrections.

It’s called Operation Clean Sweep.

WKRN reports that Unlike Operation Blackout, the Halloween sweep that TDOC conducts each year, offenders did not know officers were coming.

“We actually go into the home, let them know the reasons why we are there. We are doing a residence search of the inside and outside of your home as well as anything on the outside; out buildings, vehicles, letting them know that we are there to make sure that they are still maintaining their compliance,” said officer Carol Mathes.

Operation Clean Sweep started Wednesday and ended Saturday night. Clarksvillenow.com has confirmed that the sweep included offenders in Montgomery County, though the number of county residents checked on were not available.

Officers visited 356 homes. Eighty percent of the offenders targeted were found to be in compliance, while 65 others had violations, and four were arrested.

The arrests included violation of the sex offender registry and possession of drugs and drug paraphernalia.

The others found in violation will be sanctioned or a warrant for violation of their supervision will be requested.