The emergency service today brought a large hospital to a standstill after a patient had entered "covered with white powder".
Walsall Manor Hospital was shut down after the man arrived at A & E at 12:40.
The fire and rescue teams immediately set up a green decontamination tent and shut down part of the building as the scientists worked to identify the powder.
Eyewitness Karen Clifft said, "Walsall Manor Hospital seems to be closed, teams in chemical suits on the ground and areas that are cordoned off."
A spokesman for the West Midlands Fire Service said, "Rescue services were summoned to Walsall Manor Hospital at 12:40 pm.
"A man visiting the hospital was covered in white powder, and it seems the cause is more of a domestic incident than anything weird.
"The man is currently being tested and decontaminated by the fire department, which also identifies the white powder.
"The hospital has not been evacuated and it is not believed to pose a serious health risk to the public.
"The fire crews work with West Midlands Ambulance Service and the West Midlands Police.
"Originally there were four fire equipment in use, these have been reduced to one and they are expected to be there one hour before the end of the incident."
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A spokesman for Walsall Manor Hospital said, "The emergency services work today at Walsall Manor Hospital following an incident in which a patient was previously involved.
"The male patient came to the emergency department (ED) and alerted the staff about a powdery substance in his body that is currently being tested by specialists.
"The patient was isolated after the correct decontamination procedures and did not come into contact with other patients.
"The main entrance is currently closed, but the department is still open as usual.
"Anyone with access to ED should use the entrance of Station 29."
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