Nocco said the Doughertys weren't just trying to disable the police car, they were trying to kill the officer.
"They stop several times into what I believe was an ambush. They wanted that officer to come very close to them. They were using high-caliber rifle rounds and as you can hear in that video, they were popping many of them off," Nocco said.
Luckily, the officer was uninjured. The chase came to an end when one of the 20 shots fired gave the officer's car a flat tire.
A few hours later, the siblings allegedly robbed a bank in Valdosta, Ga. A masked woman who appears to be Lee Grace Dougherty is seen allegedly holding an Uzi gun.
"She had her finger on the trigger. We know they are trained in these weapons, they're not afraid to use them and they are extremely dangerous," Nocco said.
A digital billboard campaign is also being used by law enforcement with the Doughertys pictures being flashed in 11 states in the South and along the east coast.
"They have no fear of shooting anybody and so that is the one thing we want to make sure the public understands, that these are three violent individuals," Nocco said.
Anyone who sees them or knows their whereabouts is asked to call the FBI at (404) 679-9000 or the Valdosta Police Department at (229) 293-3145. To remain anonymous, call (229) 293-3091.