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GRAND HAVEN, Mich. (AP) _ A woman was found guilty but mentally ill of first-degree murder Friday for stabbing and poisoning her two young daughters.

Tracy Leigh Camburn, 39, told police she killed her daughters in 2001 because voices told her ``they'' were coming to torture and kill her and the girls. The bodies of her daughters Candice, 10, and Kimberly, 5, were found in their home.

Prosecutors said Camburn stabbed the children after forcing them to eat paint thinner. The girls had wounds indicating that they put up a fight, he said.