(CNN) -- Two police officers are in critical condition after a shooting Monday at a police station in Fairfax County, Virginia, an FBI source told CNN.
A suspect was wounded in the shooting, which took place about 3:30 p.m. in the parking lot of the Sully District Station, in the west of the county, police spokeswoman Beth Underhill said.
She did not comment on the condition of the wounded, but an FBI official told CNN the officers were in critical condition.
The FBI official and a Fairfax County police source said a second suspect fled the scene of the shooting and was being sought.
The U.S. Park Police said one of its helicopters was aiding in the search.
Authorities said the suspects carried handguns and automatic weapons.
"This is an ongoing investigation. We're still trying to piece together what exactly happened here," Underhill said.
Heavy security surrounded Inova Fairfax Hospital, where the two officers were brought, Monday evening.
"We have requested heightened security at the hospital, which is standard procedure for an incident of this nature," Underhill said.
Aerial footage showed emergency vehicles and yellow police tape in the station parking lot, and police cars blocking traffic on nearby streets dampened by rain.
A suspect was wounded in the shooting, which took place about 3:30 p.m. in the parking lot of the Sully District Station, in the west of the county, police spokeswoman Beth Underhill said.
She did not comment on the condition of the wounded, but an FBI official told CNN the officers were in critical condition.
The FBI official and a Fairfax County police source said a second suspect fled the scene of the shooting and was being sought.
The U.S. Park Police said one of its helicopters was aiding in the search.
Authorities said the suspects carried handguns and automatic weapons.
"This is an ongoing investigation. We're still trying to piece together what exactly happened here," Underhill said.
Heavy security surrounded Inova Fairfax Hospital, where the two officers were brought, Monday evening.
"We have requested heightened security at the hospital, which is standard procedure for an incident of this nature," Underhill said.
Aerial footage showed emergency vehicles and yellow police tape in the station parking lot, and police cars blocking traffic on nearby streets dampened by rain.
