The Dallas Fire-Rescue ambulance crew who transported the man infected with Ebola to the hospital have tested negative for the Ebola virus, according to the City of Dallas.

The City of Dallas said Tuesday that the crew took all safety precautions and was isolated and tested following the discovery.

Dallas Mayor Mike Rawlings said the emergency responders who transported the Ebola patient to a Dallas hospital are being monitored for symptoms.

The three members of the ambulance crew are restricted to their homes while their conditions are observed and while the virus' incubation period passes.

The patient was vomiting when the ambulance got to the hospital, Dallas city spokeswoman Sana Syed said.

The ambulance crew is among 12 to 18 people being monitored after exposure to the man. Some are members of his family, but not all, Syed said.

Should the ambulance crew members develop symptoms, investigators will then determine with whom they came into contact and monitor those people for symptoms as well.

The ambulance used to transport the man has been pulled from service at Station 37 in 6700 block of Greenville Avenue.

Chopper 5 showed Dallas Fire-Rescue ambulance 37 parked away from all other vehicles at the training center in the 5000 block of Dolphin Road. The ambulance was wrapped in red caution tape and blocked in.

The City of Dallas said it has activated the city's Emergency Operations Center and is on Level 2: High Readiness after receiving confirmation that Dallas has the first diagnosed Ebola case in the nation. The person moved to Dallas from Liberia a week ago.