ALBUQUERQUE, New Mexico (CBS SF) – Authorities in New Mexico believe a 5-year-old boy who has been missing for nearly a week may be with his mother in the Bay Area.

According to the Bernalillo County Sheriff’s Office, 5-year-old Mario Hernandez went missing on May 6 in the community of South Valley, near Albuquerque. Mario was last seen with her mother Nancy Flores, who does not have custody.

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Deputies said Flores refuses to return Mario and has a felony arrest warrant for custodial interference.  The sheriff’s office has issued an Endangered Missing Juvenile Alert in the case.

Mario Hernandez, Nancy Flores (Bernalillo County Sheriff’s Office)

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“We are concerned for Mario’s safety,” deputies said in a tweet Wednesday.

Flores works as a house cleaner in the Bay Area and deputies suspect they may be in San Francisco.

Mario was last seen wearing a red spider shirt, gray shorts with red stripes, along with black shoes. He is described as standing 3-foot-6 inches tall, weighing 50 pounds, with brown hair and brown eyes.

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Anyone with information about the case is asked to contact the Bernalillo County Sheriff’s Office at 505-798-7000 or to call local law enforcement.