Updated

Federal authorities say a man charged with killing a woman and raping her 10-year-old daughter after a carjacking at a New York mall last week was able to remove and reassemble his court-ordered electronic monitoring bracelet within a minute before carrying out the attacks.

Authorities say he removed and reassembled the bracelet so quickly that it may have prompted what appeared to be a false alarm or the alarm may have gone undetected for hours.

It was almost five hours before the Colorado company monitoring the bracelet notified court officers in Syracuse. Officers had told the company not to notify them of brief interruptions of monitor signals because they were getting alerts when they simply hit against something.

Twenty-nine-year-old David Renz has been charged with murder, rape and kidnapping.