A five-year-old boy shot a four-year-old boy at a playground in Hillcrest Heights, Md., about 10 miles southeast of Washington, D.C., MyFoxDC.com reported Thursday.

Police said that the victim, who suffered one gunshot wound to the torso and was taken to a local hospital, had injuries that were not thought to be life-threatening.

The shooter ran back to his family's apartment, where police later found him and the weapon. Ebony Webb says she was there when the four-year-old boy ran into his apartment after he was shot.

"We just heard a big boom, a big shot," Webb said. 

She called 911 and helped clean the wound. Officials transported the four-year-old to Children’s Hospital. Authorities say the gunshot wound is not life-threatening. 

"How did the five-year-old obtain the handgun, and who does it belong to?" Prince George's County Police Officer Mike Rodriguez asked.

One witness told MyFoxDC that it appeared to be a .22-caliber handgun.

Dee Johnson, 29, who identified himself as the shooter's uncle, told The Washington Post that the boy found the gun outside. He added that the boy's mother, who lives in the apartment with three other children, does not keep guns there.

Authorities are questioning residents of the apartment complexes about the incident, and it is possible that charges will be filed.

Click here to watch MyFoxDC.com's coverage of the playground shooting.