11:15 p.m. UPDATE: Natalie Calvo has been found alive by police at an Antioch Marina and a suspect is in custody, according to law enforcement sources.

David Allen Douglas, 43 has been identified as a person of interest in the case.

Antioch Police Chief walks into briefing room, and says "Good news". pic.twitter.com/D2Rf4TQtRJ — Andria Borba (@andria_borba) January 4, 2014

Natalie Calvo appears to be unharmed, according to Antioch police chief. — Andria Borba (@andria_borba) January 4, 2014

Suspect car plate number was found after looking through Wal-Mart security video and with a witness identification. — Andria Borba (@andria_borba) January 4, 2014

Suspect, David Douglass, has had contact with Antioch PD, but is not a registered sex offender. — Andria Borba (@andria_borba) January 4, 2014

Burks tells @CBSSF that she heard about Natalie Calvo from sister, saw car, honked and an undercover cop pulled up. — Andria Borba (@andria_borba) January 4, 2014

Burks says suspect was in back seat of car, with shirt off in Marina parking lot. — Andria Borba (@andria_borba) January 4, 2014

This is LaShay Burks, she spotted suspect car in Antioch Marina, saved Natalie Calvo pic.twitter.com/4XZbVtXEQ4 — Andria Borba (@andria_borba) January 4, 2014

Suspect in Natalie Calvo abduction in custody. Natalie is safe. Was discovered at marina right down street from Antioch PD. — Andria Borba (@andria_borba) January 4, 2014

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ANTIOCH (CBS13) — An Amber Alert has been issued for a girl abducted from her home by a suspected armed man.

Natalie Calvo, 7, was abducted from her home by an unknown Asian male approximately 40-50 years old, wearing unknown clothing and possibly armed with a black long gun.

According to our sister station, KPIX, the suspect followed Natalie and her mom home from a Walmart and confronted them with a gun. We’re also told that same Walmart may have been the scene of other attempted abductions in the past day.

The suspect was last seen driving away from the residence in a 1990s gold Toyota Camry that’s boxy in appearance.

Calvo is 3 feet tall, weighs 54 pounds, has black hair and brown eyes. She was last seen wearing a neon pink scarf and jacket, gray leggings, brown boots and her hair was in a ponytail.

Anyone with information is urged to call the Antioch Police Department at (925) 778-2441.