Fairfax County police opened fire Tuesday afternoon in a confrontation in Franconia, and a 37-year-old man was hit, authorities said.

Officers were called to the 6600 block of Thurlton Drive shortly before 4 p.m. for an initial report of someone who was suicidal, police said. After an encounter with the individual, officers fired. Police declined to describe how the encounter unfolded or how many shots were fired and an update was not available Wednesday morning.

At least one officer performed CPR on the man until paramedics arrived, police said.

The man was taken to a local hospital with life threatening injuries. No officers were injured during the incident.

On Tuesday evening, investigators could be seen walking in and out of red brick townhouse on the block where the shooting occurred. Blood was visible on the doorstep of the home. A number of neighbors said they did not know the man shot and had not seen the encounter, which they said occurred while most were at work.

No information was immediately available about whether the man had a weapon.

The officers involved will be placed on routine administrative leave as the department performs criminal and administrative investigations of the incident, police said.