Police Commissioner Ray Kelly says that the school safety officer who was the last person to see missing teen Avonte Oquendo didn't do anything wrong.
Kelly says the officer saw Oquendo at the front door of the Riverside School and told him to go back upstairs.
The teen, who has autism, apparently went down the hallway and exited through a side door.
His parents say they're suing the school.
The New York City Police Department has put more than 100 officers on the case, expanding the search beyond the city limits and placing announcements on commuter rail lines in case the teen made his way to a train.
A $70,000 reward is being offered for any information on his whereabouts.
Anyone with information on the case should contact the Crime Stoppers hotline at 1-800-577-TIPS, or text CRIMES and then enter TIP577, or visit www.nypdcrimestoppers.com.