Detroit police say a 30-year-old woman fatally stabbed a woman in her 50’s during an argument Wednesday on a Detroit Department of Transportation bus near Rosa Parks and West Grand Boulevards. The older woman bumped into the 30-year-old woman with her walker as she was getting off the bus. The woman got angry and stabbed her with a knife. The woman in her 50s later died from her injuries at a hospital. Police are looking for the 30-year-old woman