A major emergency response was launched at Hounslow Police Station on Thursday afternoon after a staff member was taken seriously ill, believed to have inhaled fumes from a hazardous substance.

The incident unfolded around 3:30 PM, prompting an immediate evacuation of the entire building. A large cordon was established as specialist units from the London Fire Brigade, including hazardous materials teams, arrived on scene.

HART paramedics from the London Ambulance Service, alongside doctors from the London Air Ambulance, also responded to the critical situation.

It is understood that the staff member became seriously unwell after being overcome by the potent fumes. The exact source of the chemical and how it was released remains under investigation. Fentanyl, a powerful synthetic opioid, poses a significant health risk even in small quantities, making the situation particularly dangerous for first responders.
A London Ambulance Service spokesperson confirmed that specialist paramedics were treating at least one individual on site but did not comment on their current condition. It remains unclear whether anyone else was affected by the fumes.

We have reached out to the Met Polcie, London Ambulance Service and the London Fire Brigade for further updates and are awaiting additional details on the condition of those involved.
The police station remains closed as investigations continue, and authorities have urged the public to avoid the area until the situation is fully under control.
This is a developing story, and more information will be provided as it becomes available.
Met spokesperson: Hounslow Police Station’s front office was temporarily closed at 15:30hrs on Thursday, 20 February due to a parcel received which contained an unknown powder.
The London Ambulance Service and London Fire Brigade attended as a precaution. No one was injured and the area was deemed safe.
The incident has now been stood down.
Ed Note: We await further confirmation on the staff member taken ill as a result and if this is connected to the incident