UPDATE (6/5, 5:00pm ET):
Harry's body has been found in a Lowell, Massachusetts pond, sources told local station WCVB.
A large-scale search is underway for a Black Massachusetts toddler who was last seen playing in his babysitter's yard.
Police said they began the search immediately after Harry was reported missing at around 9:30 a.m. on Tuesday. Neighbors have been asked to join the search and look for the boy in their properties and vehicles.
Harry's father told WCVB Boston, "He's active. He likes going outside. When he's at home, he goes to the yard and plays. He's a healthy kid but he can't speak. He's trying to learn how to speak, but he can't talk."
According to the Lowell Police Department, officers are focusing their efforts around the babysitter's home. Police have requested that volunteers stay away from the area where the 3-year-old boy was last seen.
"Right now we are concentrating efforts with law enforcement personnel and we are trying not to contaminate search areas," the Lowell Police Department said in a statement via Twitter.
Harry was sporting a long-sleeve maroon shirt and gray pants before he went missing, police said.
Lowell Police Chief Barry Golner said no evidence of foul play has been found.
"We are still treating the incident as a missing person, a missing child. All our efforts have been focused on re-searching, retracing. We brought in other assets today -- the state police, we have everything from mounted units to marine units," Golner said.