Police in Ioawa have released an endangered person alert for siblings Billy and Ashley Hernandez-Alvarado, who were reported missing Sunday night.

The Toledo Police Department said the children are believed to be with their mother, Ciria Alvarado-Argueta, 33, and Alexic Alvarez-Gomez, 28, KCCI reported.

Two vehicles are listed as possible suspect vehicles: a gray Nissan Quest, Iowa tag NVB078, and a white Kia Sorento, Iowa tag LLS086.

Billy is 9-year-old and Ashley is 8, invetigators said.

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[Featured image: Billy and Ashley Hernandez-Alvarado/Toledo Police Department]