Investigators in Colorado and Wyoming have issued missing child alerts for two young girls who were allegedly abducted by a non-custodial parent.

Aspen Roth, 4, and Serenity Naslund, 2, were reportedly taken from Buffalo, Wyoming, around 10 a.m. Sunday morning by Alexis Roth, 23.

The Wyoming Highway Patrol has issued an Amber Alert in the case, while the Colorado Bureau of Investigation has issued a missing person alert, KUSA said.

The group would travel to Amarillo or Grand Prairie, Texas, and travel through Colorado, authorities said.

Aspen Roth is described as 3ft 5in tall and weighing around 30lbs, with brown hair and hazel eyes. Serenity Naslund is described as 3ft 25lbs tall with blonde hair and hazel eyes.

Alexis Roth is 5ft 5in and weighs 120lbs, with brown hair and eyes.

Investigators said a 3-month-old baby was also among the group. Alexis Roth is the babysitter.

Roth is believed to be driving a white 2009 Dodge Caravan with the Wyoming license plate #16-9068.

Anyone with information should call 911 or the Buffalo, Wyoming, police department at 307-684-5581.

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[Featured image: Serenity Naslund, Alexis Roth, Aspen Roth/Buffalo, Wyoming, Police Department]