Syracuse, N.Y. -- Probation officers who were supposed to be keeping an eye on David Renz ignored 46 alerts that his GPS monitoring bracelet had been tampered with, according to a report released this afternoon by U.S. District Judge Gary Sharpe.

Some of those alerts lasted just minutes, but others lasted for as long as four hours before the GPS bracelet sent a signal telling the Colorado monitoring center that it was working correctly.

There were seven long alerts telling probation officers that Renz's monitor had been tampered with in the month leading up to March 14. That's when police say the 29-year-old Renz attacked and killed Liverpool school librarian Lori Bresnahan and raped a 10-year-old girl, according to the report. Bresnahan died trying to save the girl, prosecutors said.

Renz was issued the monitor Jan. 11 after he was released from federal custody while awaiting trial on child pornography charges, according to the report. The first indication that he was trying to get out of the ankle bracelet came four days later.

Probation officers in the Syracuse U.S. Probation Office decided to ignore federal protocol when they told the Colorado monitoring center not to notify them when a monitor issued a tamper alert but sent a signal that all was well again in five minutes or less.

It took Renz less than one minute to get his bracelet off, reassemble it, and set it down in his house. The bracelet was held together with duct tape and a screw when authorities found it, according to the report. There was no way to know how long it had been that way because the bracelet had not been inspected since it was issued to Renz in January, according to the report.

Check back later for a full report on the investigation.

Contact Marnie Eisenstadt at meisenstadt@syracuse.com or 315-470-2246.

Report on the U.S. Probation Office monitoring of David Renz - Redacted