Lauren Spierer, 20, disappeared early last Friday after a night out with friends. Her parents told ABC News that surveillance video from Lauren's apartment building shows her and a friend arguing with a group of men just two hours before she disappeared.
At Thursday morning news conference, police in Bloomington, Ind., denied that report.
"I do want to make kind of a definitive statement that Lauren was not involved in any altercation. All of our information including video and interviews indicates that Lauren was not involved in any altercation. So, I kinda want to make that clear," said Lt. Bill Parker with the Bloomington Police Department.
Police conducted polygraph tests as part of their investigation. A $100,000 reward is now being offered for her return.