A New York City first-grader was forced to walk the streets alone after he was dumped from a school bus after it had reached the end of the line, the New York Daily News reported Tuesday.

School officials said they don't know who put Jaeden Vasquez, 5, on the school bus — especially since he wasn't even supposed to be on it in the first place. He lives across the street from the school in the Bronx.

His mother, Aileen Bonilla says the school apologized but that "sorry" wouldn't have replaced her son if he had gotten killed.

"You just let a child off a bus when no one's there for him?" Bonilla told the Daily News. "You don't know what could have happened."

Jaeden was returned to his mother after the boy approached a woman on the street and told her he was lost. The woman called the school and brought the boy there in a cab, the Daily News reported.

School officials claim that don't know who the school bus driver was, but he may have acted inappropriately. They have launched an investigation.

Five-year-old children are not supposed to be let off school buses unless an adult is waiting, according to Department of Education rules. If an adult is not there, the driver is required to bring the child back to school, the Daily News reported.

Click here for more on this story from the New York Daily News.

The Associated Press contributed to this report.