The Latest on a Houston woman charged with killing her two children: (all times local):

6:55 a.m.

Authorities say a Houston mother who calmly told an acquaintance that she drowned her two children in a bathtub is being held without bond in the deaths.

Harris County criminal court records show 30-year-old Sheborah Thomas was jailed Monday on a charge of capital murder of a person under age 6.

Thomas was arrested Sunday after the bodies of her 7-year-old son and 5-year-old daughter were found under a neighbor's house. Authorities have not yet confirmed a cause of death but said an acquaintance of the woman told police that Thomas said she had drowned the children. Autopsies were ordered.

Houston police spokesman Kese (KEES) Smith says investigators have not determined a motive. Smith says all indications are that Thomas acted alone.

Online records do not list an attorney to speak for the mother.

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6:10 a.m.

Authorities say a Houston mother who matter-of-factly told an acquaintance that she had drowned her two children in a bathtub has been charged in their deaths.

Houston police spokesman Kese Smith told The Associated Press that 30-year-old Sheborah Thomas was charged Sunday with capital murder.

Smith says "all indications are she is the one who acted alone" in the killing of her 7-year-old son and 5-year-old daughter, whose bodies were found under a neighbor's house Sunday.

He says the mother told an acquaintance that she had killed the children.

Smith says Thomas was so matter-of-fact about it that he thought she was joking.

Smith says investigators are interviewing the mother and have not determined a motive.