updated 4/17/2009 8:48:55 AM ET 2009-04-17T12:48:55

Authorities in a city just south of Boston said a pregnant woman killed her 9-year-old daughter and stabbed herself in the stomach to kill her unborn child.

Norfolk District Attorney William Keating said 38-year-old Fang Chi Xue was treated for self-inflicted stab wounds to the arms and abdomen at Boston Medical Center and was expected to be arraigned Friday on two counts of murder. She was 7 1/2 months pregnant.

Police were called to the family home Thursday night by a 14-year-old girl who survived the attack with minor injuries.

Keating said the 9-year-old girl suffered stab wounds to her wrists, but authorities were also investigating whether she was poisoned.

Keating said the incident was sparked by an argument.

Copyright 2009 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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