Editor's note: The Boston Police Department initially described the victim of this incident as an infant, but later said it was a 4-year-old child who fell out the window.
A 4-year-old boy was seriously injured after falling from a fourth-floor window of a Boston building on Wednesday afternoon.
The Boston Police Department said it received a report of a child out a window on American Legion Highway near the Dorchester-Roxbury line around 3:17 p.m. When they arrived, police said they found the child outside, suffering from serious, life-threatening injuries.
The boy was taken to an area hospital and is listed in critical condition, Boston Police Superintendent Felipe Colon said.
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Visibly shaken and distraught, Erika Moon told NBC10 Boston later Wednesday that her son Isaak has autism spectrum disorder and is nonverbal. She says he doesn't recognize danger.
"I've been telling the people we can't be on the fourth floor, he has no sense of danger. He don't even speak," Moon said through tears.
According to Moon, her son was playing in his room Wednesday afternoon just before she heard a loud boom.
"I went running down and picked him up and he wasn't breathing," she said.
Moon says her son managed to open a gate blocking her window in their fourth floor apartment. She claims that's when he leaned out and fell from the top floor.
"He's in critical condition right now, I just want everybody to pray for him," Moon said, noting that she's still waiting to learn more from the doctors about the extent of her son's injuries.
Neighbors who spoke to NBC10 Boston Wednesday said they heard screaming outside, prompting them to look out the window.
"And when I looked there was the kid and then the mother came down and was crying with him," one man said.
Wednesday's incident is being jointly investigated by the Suffolk County District Attorney's Office and Boston detectives, as well as the homicide and crimes against children divisions, according to Colon, who noted that it's protocol for all of these teams to respond.
Investigators are working to determine if what happened was an accident. There's no one in custody in connection to the incident, Colon said.