DELAWARE COUNTY, Oklahoma - An Amber Alert has been issued for two Delaware County children. 

Authorities said 20-month-old Adelyn Keener and 2-month-old Maxwell Keener are missing and may be with their mother. Authorities say the mother may be driving a silver 2002 I35 Infiniti with Oklahoma tag 107-FCR.

The mother has been identified as 31-year-old Sarah Jane Lewis. She has a history of incarceration on drug-related charges and is believed to use methamphetamine in the presence of her children. 

The children are said to be in immediate danger due to her intravenous drug use.

According to the Amber Alert bulletin Lewis is white, 5'8" with brown eyes and brown hair. She and the children were last seen in Payne County.

If you see the vehicle or Lewis, call the Delaware County Sheriff's Office at 918-253-4531 or 911.