Las Vegas ? Three more people have been arrested in connection with a shooting at a school bus stop that wounded six people, police said.

Authorities said 18-year-old Dresden Williams, 20-year-old Erica Adams and a 17-year-old male were arrested Sunday night in Las Vegas and booked on charges related to the Dec. 11 shooting.

A fourth person was arrested in Denver last week after getting off a Greyhound bus on his way to Chicago, police said. Nicco Tatum, 18, remained at the Denver County jail Wednesday, pending transfer to Nevada. The jail said it had no information about a lawyer.

Authorities say a school bus had just unloaded high school students on a Las Vegas street corner when shots were fired. Two teenagers hit in the torso were hospitalized, and four others suffered minor injuries.

The shooting stemmed from a scuffle at the bus stop a day earlier involving one of the shooting victims and Tatum, according to arrest reports.

Both victims who were hospitalized have been released.