Update at 5:10 p.m. — Arlington County officials say in a press release that the woman who was sick at the Pentagon this morning does not have Ebola.

Based on the public health investigation, which included the travel history of a woman who became ill this morning in a Pentagon parking lot, and on questioning of her by medical staff, medical authorities are confident that she does not have Ebola. Arlington County Fire Department Emergency Medical Services transported the woman to Fairfax Inova Hospital Friday morning, after she became ill in a Pentagon parking lot. The woman had displayed symptoms consistent with the virus and her travel history was uncertain. She was put in isolation at Fairfax Inova Hospital. Arlington County took all necessary precautions to protect public health during this event, including activating its Emergency Operations Center. We are beginning to break down those operations now.

(Updated at 5:05 p.m.) Arlington County’s responded to the Pentagon this morning due to an possible Ebola case on a tour bus.

Medics responded to the Pentagon this morning for a report of a woman on a bus who was sick and vomiting. When they were told that she had recently arrived from Africa, the hazmat team was called out of “a complete abundance of caution,” Pentagon Force Protection Agency spokesman Chris Layman told ARLnow.com.

A large portion of the Pentagon south parking lot was cordoned off with caution tape, and police are telling those who don’t work at the Pentagon to avoid the immediate surrounding area.

The woman — who reportedly boarded the bus at the Pentagon, got sick in the bathroom then got off — was transported via ambulance to a Inova Fairfax Hospital. The county’s medical director also responded to the call and went to the hospital with the patient, according to scanner traffic.

A tipster with knowledge of the emergency response told ARLnow.com that the patient claimed she recently traveled from the West African nation of Sierra Leone. That was confirmed by D.C. health department officials. However, an Associated Press report is now questioning whether she has, in fact, been out of the country.

The tipster also said that four Arlington firefighters were held at the hospital for much of the day due to possible exposure, and are now monitoring themselves for signs illness. That tip could not be immediately confirmed. The AP is reporting that seven Pentagon police officers might have also been exposed and are being monitored.

Arlington medic units and Fairfax hazmat units are on scene at Inova Fairfax Hosptial, according to news helicopter footage.

As of 10:50 a.m., Arlington County was mobilizing its Emergency Operations Center to deal with the incident, according to Arlington County Police spokesman Dustin Sternbeck.

Just before noon, the county issued the following press release.

Arlington Responds to Possible Ebola Case At about 9:10 a.m. today, Pentagon Police officers identified a woman in the Pentagon South Parking Lot, around lanes 17-19, who was ill and vomiting. Arlington County Fire Department (ACFD) was notified and responded immediately with both emergency medical aid and HazMat response team. During the response, the individual allegedly indicated that she had recently visited western Africa. Out of an abundance of caution, all pedestrian and vehicular traffic was suspended around the South Parking lot, while Arlington County responded to the scene. At 9:53 a.m, the patient was taken to the Virginia Hospital Center; however she did not exit the ambulance. ACFD then transported the patient to Fairfax Inova Hospital. Arlington Public Health is directing the public health response to this incident. Arlington County has activated its Emergency Operations Center (EOC) and a Joint Information Center (JIC) to manage the incident. At the Pentagon

Out of an abundance of caution and to allow the investigation to proceed, pedestrian and vehicular traffic around the Pentagon South Parking lot’s lanes 7-23 will remain restricted until further notice. The Corridor 2 entrance to the Pentagon is also closed. More information will be released when it becomes available.

Arlington firefighters and the hazmat team cleared the scene at the Pentagon around 1:45 p.m.

The bus the woman boarded was later stopped and detained near D.C.’s Capitol Hill neighborhood.

Bus from possible #Ebola case now held at 7th & I SE DC. pic.twitter.com/LiPOziRqBJ — Bruce Leshan (@BruceLeshan) October 17, 2014

Despite numerous Ebola scares in the United States, there have been fewer than 10 confirmed cases in the country. Today President Obama named an “Ebola czar” to help coordinate the federal response to the outbreak threat.