Navajo Nation works on Amber Alert in shadow of girl's death

After a young girl was abducted on the Navajo Nation and found dead the next day, tribal officials faced tough questions about why an Amber Alert system proposed years earlier was never implemented.

Now, Navajo officials' proposal to build one of their own to cover the 27,000-square-mile reservation, which would be the first specifically for tribal land, is drawing attention to the systems they have been using with Arizona, New Mexico and Utah.

The systems from the states that encompass the Navajo Nation are similar but can have small differences that keep alerts on child abductions from being sent simultaneously and across the entire reservation. They won't automatically...