SAN ANTONIO -- Seguin police are trying to figure out Monday how a 28-year-old mother of two suddenly disappeared.

Amber Lynn Smith was reported missing at 7 a.m. on Sunday by family members after they found the woman's 2-month-old and 4-year-old children home alone.

Smith was last seen around 7 a.m. on Saturday.

Smith's car and all her belongings were not missing when police began their investigation.

Police said that family members told them that it was unlike Smith to leave her children behind.

"She just wouldn't disappear," said Detective Maureen Watson, of the Seguin Police Department. "She wouldn't leave without any contact with them. She's very close to her family. So, this is really worrying us."

Police have interviewed Smith's common-law husband, who was not at home when she was reported missing.

Smith is 5-foot 3-inches tall and weighs about 100 pounds. She has blue eyes and shoulder-length brown hair with blond highlights that is usually worn in a ponytail.

Anyone with information is urged to call the Seguin Police Department at (830) 379-2123.