A Farmington, NM, police sergeant was shot and wounded Monday in an exchange of fire with an active shooter who killed three elderly people driving by in their vehicles and wounded or injured five other civilians.

Sgt. Rachel Discenza arrived on the scene minutes after the 18-year-old male suspect began firing at houses and vehicles in his neighborhood. She confronted the shooter and they both opened fire. She was hit in the pelvic area. The suspect—a Farmington High School student—was killed.

New Mexico State Police Trooper Andreas Stamatiads was arriving at the scene when he came under fire and was injured.

Sgt. Discenza was treated and released at a local hospital. Trooper Stamatiads remained hospitalized as of Tuesday afternoon.

Officials say footage of the attack, which began at 10:56 a.m. was captured by a Ring doorbell camera. That footage has not been released. At 10:57 officers were dispatched and multiple officers were on scene by 11:06.

Farmington officials said they have not discovered a motive for the attack and they believe the victims were randomly targeted.

The gunman was reportedly armed with three firearms, including a semi-automatic rifle. Officials say they have recovered at least 150 casings at the crime scene, which covers more than a quarter mile.