Los Angeles police say it may have been self-defense that drove a woman to pepper-spray about 20 shoppers on Black Friday at a Walmart store.
The Los Angeles Times reports Monday that detectives have interviewed 14 witnesses and want to talk to 10 more shoppers about the incident.
Detective Mike Fesperman says the case will come down to whether the pepper-spraying was a matter of self-defense or an inappropriate shopping tactic.
Police also are examining store security videos and YouTube videos in which you can hear people saying "I'm being trampled.''
The woman came to the LAPD Saturday, but declined to answer questions and was not taken into custody. An investigation is ongoing.