In January 2010, Klass claimed she received a warning from Hertfordshire Police for brandishing a kitchen knife (through a window) at a group of teenagers who entered her garden while she and her daughter were alone in the house. She said that she was "utterly terrified" and "aghast" at the response by the police.</ref> Hertfordshire Police denied making any such warning and stated that the law allows householders the proportionate use of force to protect themselves. It has subsequently been reported that it was Klass's agent or publicist who notified the police of the incident and who then passed on the story to "The Sun"'s reporter, Emma Cox.