A 13-year-old boy was arrested after he shot and Thomas Caldwellkilled a man on a bus in Denver, police said.

The Denver Police Department announced the arrest over the Jan. 27 incident on Friday. Police are not releasing the name of the suspect since he is a minor.

“At this stage of the investigation, it appears there was verbal exchange between the suspect and victim about the victim’s leg blocking the aisle on the bus, and the suspect then shot the victim,” police said in a news release.

Police said they responded to the shooting at around 6:40 p.m. and found a 60-year-old man suffering from a gunshot wound on the bus at the intersection of South Federal Boulevard and West Mississippi Avenue.

The man was taken to a hospital where he was pronounced dead.

Another person suffered a minor injury and was treated at the scene, police said .

"Through the extensive investigation, detectives identified the suspect to be a 13-year-old male who was taken into custody late Thursday afternoon," police said.

The minor is being held for investigation of first-degree murder, however, the final charges will be determined by the Denver District Attorney’s Office, police said.

Police said the investigation is ongoing.