The family of a missing Queens teenager last seen Friday afternoon has put the city on legal notice.
An attorney for Avonte Oquendo's family says a notice of claim was filed with the courts.
That comes before an actual lawsuit.
Meanwhile, police converged on the Queens waterfront in search of the teenager.
Police posted flyers depicting Oquendo around Hunter's Point South Park.
His family says the young man cannot verbally communicate and is unable to care for himself.
Previously released surveillance video shows him walking out of the Center Boulevard School in Long Island City.
The Department of Education says the school has a security guard and that all special education classes have an extra aid.
"Our heart goes out to the mom," said Schools Chancellor Dennis Walcott. "I have a call in to the mom right now, and also, we've been in daily conversations with the police department. So we'll see what happens with the investigation."
Avonte is described as 5 feet, 3 inches tall and around 125 pounds.
He was last seen wearing a gray striped shirt, black jeans and black sneakers.
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.