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A chemical reaction in a non-patient plant room at Guy\u2019s Hospital on 14 August led to the release of chlorine gas, the precautionary evacuation of about 150 people and treatment of several staff for inhalation injuries; emergency services contained the scene and the site has since reopened while investigations continue.<\/p>\n<\/div>\n
A chemical incident at Guy\u2019s Hospital in London Bridge on the morning of 14 August 2025 prompted the precautionary evacuation of roughly 150 people from the basement and ground-floor areas and left one staff member injured, with several colleagues treated for inhalation of chlorine gas. The event took place in a non-patient plant room; emergency services moved swiftly to contain the scene and the hospital later advised patients that appointments should go ahead unless they were contacted directly. (See below for source details.) <\/p>\n
London Ambulance Service deployed a range of resources, including ambulance crews, hazardous-area response paramedics and an incident response officer, and treated nine people at the scene, taking four to hospital while discharging the remainder there. \u201cWe treated nine people at the scene. We took four patients to hospital and discharged the other five patients at the scene,\u201d a London Ambulance Service spokesperson said in a statement. Ambulance crews remained on site alongside fire crews while medical assessments were completed. <\/p>\n
Firefighters from several stations attended with specialist hazardous materials officers and rescue units; teams ventilated the affected area and conducted monitoring sweeps to check for elevated chlorine readings. London Fire Brigade said crews focused on ensuring there were no elevated gas readings and making the area safe, and that operations were stood down later that morning once the scene had been cleared. <\/p>\n
Early accounts indicate the chlorine was produced after chemicals were mixed in the plant room. Police at the scene suggested the leak may have involved an accidental mixing of chlorine with sulphuric acid, but emergency services emphasised that investigations to establish the precise sequence of events were ongoing and that the cause had not been formally confirmed. Reporting at the scene delivered slightly different emphases \u2014 some accounts underlined the plant-room location and accidental mixing as a working theory while others reported only that a chemical reaction had produced chlorine gas. <\/p>\n
Chlorine is a respiratory irritant: even relatively small exposures can inflame the eyes, throat and lungs and higher concentrations carry the risk of more serious, even fatal, harm. Staff who helped the injured colleague were among those treated for inhalation, according to the hospital. Guy\u2019s, which forms part of Guy\u2019s and St Thomas\u2019 NHS Foundation Trust and is a major elective centre with around 400 beds specialising in cancer, renal, urology, dental and other services, said patient-facing services had resumed once the area was declared safe. <\/p>\n
A spokesperson for Guy\u2019s and St Thomas\u2019s reiterated the trust\u2019s position in a statement: \u201cOne staff member was injured and several people, who came to the aid of the person, were treated for the inhalation of chlorine gas. The site has now reopened and people should attend their appointments unless they are contacted by us directly.\u201d While the trust described services as resuming safely, emergency crews remained the authoritative voice on clearance and air-quality monitoring. <\/p>\n
Video and live coverage from the scene captured crews escorting evacuated people from the hospital and showed emergency vehicles lining St Thomas Street, underscoring how quickly services responded and how the incident briefly disrupted activity around the London Bridge hospital complex. Eyewitness reporting and contemporary footage complemented official updates by conveying the scale of the response and the precautionary nature of the evacuations. <\/p>\n
Emergency services have declared the immediate incident over and stood down firefighters after making the area safe, but the circumstances that led to the release of chlorine will be subject to further review by the hospital, the trust and relevant regulatory and safety authorities. Given the differing early accounts about what exactly mixed to create the gas, investigators are likely to seek plant-room records, chemical-storage logs and staff accounts to determine whether procedural failures, equipment faults or an accidental mixing of substances were involved. <\/p>\n