A man believed to be the father of a patient is thought to have taken at least two people hostage at a hospital in Texas.
It was not immediately clear if the man was armed.
The Harris County Sheriff's Office said it believed the man was a distraught parent of a patient and at least two people were being held hostage at the Tomball Regional Medical Centre, near Houston.
A supervisor at the county's emergency dispatch centre said the situation was in the critical care unit and began around 7pm local time.
The hospital is on a 150-acre campus about 30 miles north-west of Houston in the United States.
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The Texas hospital that treated Liberian national Thomas Eric Duncan, who died last week of Ebola, has apologised to his fiance for being unable to save his life.
Duncan's fiance, Louise Troh, 54, said in a statement she received a call from a top official at Texas Health Presbyterian Hospital, who said the hospital was "deeply sorry" for the way Duncan's case was handled.
I am grateful to God that this leader reached out and took responsibility for the hospital's actions. Hearing this information will help me as I mourn Eric's death.
Troh, her 13-year-old son, and two relatives of Duncan have been in mandatory quarantine at an undisclosed location within the city limits for nearly three weeks. Their isolation is scheduled to end on Sunday if they are given the all clear.
An official from the Texas hospital where two nurses contracted Ebola has admitted mistakes were made in their treatment.
ITV News Washington Correspondent Robert Moore reports from Dallas:
It has now been confirmed that the remaining patient here, Nina Pharm, also known as 'Nurse 1' will be transferred from this hospital to a specialist unit in Maryland, just outside of Washington DC.
I think here everybody recognises this is has been a public health and a public relations disaster, but less talked about and probably more significant is how valuable a lesson this has been.
Really teaching everybody around the world that however sophisticated your medical infrastructure is, when it comes to the Ebola virus nothing really beats good preparation and excellent education.
A senior official of the Texas hospital system has said "we made mistakes" in diagnosing a Liberian man who had Ebola and later died.
Dr. Daniel Varga, chief clinical officer and senior vice president of Texas Health Resources, added that mistakes were made in giving inaccurate information to the public, adding that he was "deeply sorry."
He also admitted there was no actual Ebola training for staff before the first patient arrived.
A hospital in Dallas where two health workers have contracted Ebola has set up a room for employees who are worried about spreading the virus to friends and family.
The Texas Health Presbyterian Hospital emphasised that the room was not intended for any of the staff who are being official monitored after treating Ebola victim Thomas Eric Duncan. These staff are being treated in a separate part of the hospital.
Texas Health Dallas is offering a room to any of our impacted employees who would like to stay here to avoid even the remote possibility of any potential exposure to family, friends and the broader public.
We are doing this for our employees’ peace of mind and comfort.
This is not a medical recommendation.
A man who flew from Liberia to Texas has become the first patient infected with the deadly Ebola virus to be diagnosed in the United States, health officials said.
The patient sought treatment six days after arriving in Texas on September 20th, Dr. Thomas Frieden, director of the US Centers for Disease Control and Prevention, told reporters.
He was admitted two days later to an isolation room at Texas Health Presbyterian Hospital in Dallas.
On Tuesday, Frieden and other health authorities said they were taking every step possible to ensure the virus did not spread widely.
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