A weekend argument ended with a woman stabbing her own sister, according to state police.
It happened just before 9 a.m. Saturday in Tyrone Township, Perry County.
Using a kitchen knife, 24-year-old Ashley Marie Lopez stabbed her sister in the upper left torso, troopers said.
The victim now faces serious lung injury and is being treated at Penn State Hershey Medical Center.
Lopez is in Perry County Prison on assault charges.