Friends, family seek clues in Petaluma woman's disappearance

Law enforcement officials in Nevada and South Lake Tahoe expanded their search Thursday for a missing Petaluma woman and announced they are examining activity on her cellphone that came later than the last known use.

Alyssa Byrne, 19, vanished early this week while in South Lake Tahoe for a three-day music festival.

In a press conference Thursday evening, Douglas County Undersheriff Paul Howell said a "ping," some kind of activity, on her cellphone was recorded at 12:03 a.m. on Jan. 1.

It hadn't been determined if the activity — which came 10 minutes after the last known use of her phone — was a text or a phone call.

"Since that time the phone has gone inactive," Howell said.

He cautioned that activity on her phone wouldn't necessarily pinpoint her location — just her phone's.

The Air Force Rescue Coordination Center at Tyndall air base in Florida is examining the cell activity, Howell said.

The FBI and search and rescue officials from Nevada and California also joined the search, as have those from the National Center For Missing and Exploited Children.

Howell said authorities were doing a "room-to-room search" of the Horizon Casino Resort, where Byrne and her friends were staying.

Security officers at the Horizon and other casino are going through their security footage, Howell said. No other sitings have surfaced.

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