PHOENIX (AP) -
Police continue to follow up on leads in Arizona and neighboring states as they search for a young Phoenix woman missing since last month.
Authorities have received tips from people across the Southwest who say they've spotted the vehicle of 25-year-old Holly Marie Bruce.
But Phoenix police say none of the tips have panned out.
Bruce has been missing since Dec. 4.
Friends and family members continue to search for Bruce, commissioning two small planes to search areas she enjoys visiting.
The Arizona Republic says authorities also are using forensic tools to monitor Bruce's cell phone and credit card activity, but there has been none so far.
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