The Latest on the search for an Oklahoma woman who police say stabbed one child and fled with another (all times local):

5:58 p.m.

Investigators say a woman who allegedly bound and gagged her three daughters, stabbed the eldest repeatedly and set their house on fire told them she had become upset after observing two of her children reading a book.

Authorities say 39-year-old Taheerah Ahmad was arrested Tuesday in downtown Tulsa. Ahmad's 7-year-old daughter who had been reported missing was found safe.

Ahmad told investigators during interviews Tuesday afternoon that she became upset after observing her children reading a book, although it was not known what book they were reading.

Police say the 11-year-old girl is in "very severe condition" in a Tulsa hospital after being repeatedly stabbed.

Ahmad was booked into the Tulsa County Jail on complaints of assault and battery with a deadly weapon with intent to kill, child abuse and first-degree arson.

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12:45 p.m.

Tulsa police say they've taken into custody a woman who bound and gagged her three daughters, stabbed the eldest repeatedly, and set their house on fire.

Police said Tuesday that a 7-year-old girl who was reported missing has been found safe.

Authorities say a patrol officer located 39-year-old Taheerah Ahmad in her vehicle in downtown Tulsa, and she was taken into custody without incident.

Authorities had been searching for Ahmad since Monday night, when officers found her house on fire and her 11-year-old daughter suffering from multiple stab wounds.

Police say the 11-year-old girl is in "very severe condition" in a Tulsa hospital.

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12:10 p.m.

Tulsa police say an 11-year-old girl who was found bound and stabbed in a burning home is in "very severe condition."

Tulsa police say the girl's mother stabbed her Monday night before setting the house on fire and fleeing with a younger sibling, who's still missing.

Police said Tuesday that the 11-year-old is unconscious and is breathing with the help of a tube.

The mother, identified by Tulsa police as 39-year-old Taheerah Ahmad, has not been located.

An Amber Alert says Ahmad may be driving a black Lexus RX300 SUV with paper tags, a 2011 Ford Escape or a navy blue Ford sedan.

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6:30 a.m.

Police in Oklahoma are searching for a woman who they say bound and gagged her three daughters, stabbed the eldest repeatedly, and set their house on fire.

A 7-year-old girl is missing along with the mother, identified by Tulsa police as 39-year-old Taheerah Ahmad.

Tulsa Police Officer Jeanne MacKenzie says the 7-year-old girl, Hafsa Hayle, helped her 9-year-old sister escape, and the 9-year-old ran to a nearby house for help. MacKenzie tells the Tulsa World that when authorities arrived, they found an 11-year-old girl in critical condition with stab wounds and the house on fire.

Police believe Ahmad fled with the youngest girl.

An Amber Alert says Ahmad may be driving a black Lexus RX300 SUV with paper tags, a 2011 Ford Escape or a navy blue Ford sedan.