WATERLOO, Iowa (AP) — A Waterloo woman has been charged with murder in the house fire deaths of a mother and her son.

The Waterloo-Cedar Falls Courier reports police on Monday charged 41-year-old Denise Susanna O'Brien with two counts of first-degree murder.

The charges stem from an April 22 house fire that killed Ashley Smith and her 9-year-old son, Jaykwon Sallis. The fire was started on the home's porch.

Court records show a restraining order barred O'Brien from going to the house, where she was involved in a dispute with a resident.

Three people escaped the fire. Firefighters pulled Smith and Jaykwon out but they later died.

O'Brien was charged April 23 with violating the restraining order, and last week a judge found her guilty of misdemeanor criminal mischief for an earlier incident at the home.

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Information from: Waterloo-Cedar Falls Courier, http://www.wcfcourier.com