ALBANY, N.Y. (AP) — A man charged with killing a woman and raping her 10-year-old daughter after a carjacking at an upstate New York mall last week was able to remove and reassemble his court-ordered electronic monitoring bracelet to go undetected for hours while carrying out the attacks, federal authorities said.

David Renz, 29, put the ankle bracelet back together so quickly that it may have prompted what appeared to be a false alarm Thursday night. Officials had told the company not to notify them of the briefest interruptions of monitor signals because they were getting alerts when the bracelets simply struck something.