A Silver Alert has been issued for a missing 70-year-old woman who is diagnosed with a cognitive impairment. 

Mary Smith was last seen at 12:30 a.m. Wednesday on Silver Rock Drive in Trophy Club driving a silver Kia Sportage, with Texas license plate JVB5607. 

Smith is 5-feet-5, weighs 115 pounds and has brown hair and eyes. She was last seen wearing a black long-sleeved shirt, black pants and white sandals, police said. 

Authorities believe Smith's disappearance could pose a "credible threat" to her health and safety. 

Anyone with information is asked to call Trophy Club police at 682-237-2960.