Fairfax County police officers fatally shot an armed man in Centreville early Thursday after he approached officers and refused to drop the weapon, authorities said.

Ricardo Leon, 34, who lived at a townhouse in the 6100 block of Kendra Way, was pronounced dead at the scene.

Officers were called about 1:30 a.m. Thursday for a report of a disturbance, said Officer Bud Walker, a Fairfax police spokesman. Walker said the disturbance was not a domestic incident but declined to elaborate.

As officers arrived, they saw Leon, who was carrying a shotgun, inside an open ground-level garage, Walker said.

Police said that Leon began walking toward the officers and that they took cover. The officers ordered Leon to stop and drop the weapon, but he did not, police said. At that point, one or more of the officers opened fire.

Officers gave Leon first aid until fire and rescue personnel arrived, police said.

A woman inside the home and a neighbor had placed the initial 911 calls for a disturbance.

Walker could not confirm the relationship between the woman and Leon.

Officers were investigating the incident, and the Fairfax police internal affairs unit was also conducting a probe, which is standard procedure in a police-involved shooting, Walker said. Four officers involved in the shooting were placed on routine administrative leave while the investigation continues.