Three people were killed and 15 more were injured in a mass shooting at a New Mexico park on Friday night, officials said. The shooting happened at about 10 p.m. at Young Park, police in Las Cruces in the southern part of the state said on Saturday. The deceased victims were two 19-year-old men and a 16-year-old boy. The injured ranged in age from 16 to 36 years old. The shooting began as an altercation between two groups of people at an "unsanctioned car show" that escalated into gunfire between the groups, Police Chief Jeremy Story said at a news conference. Bullet casings were found mostly in the parking lot at the park, but some were found throughout the park and toward the street, police said.