Bristol tennessee police are searcing for a woman who tried to hold up a city convenience store at knifepoint early this morning. According to police the bandit entered the shell station on west state street, brandished a box cutter and demanded cash from the clerk. The clerk refused to open the cash drawer and quickly called 911. The robber fled on foot. She’s described as a white female, 40 to 50 years old last seen wearing a purple hoodie. Anyone with information should contact police.