© Licensed to London News Pictures. 04/04/2020. Watford, UK. Police stand guard at entrances to Watford General Hospital after a critical incident was declared. A statement released said: “As a result of a technical issue with our individual hospital’s oxygen equipment, which does not pose any risk to our patients, West Herts Hospitals NHS Trust declared a critical incident on Saturday April 4 and has asked that people do not attend Watford General Hospital. A small number of patients are being transferred to other hospitals in the area, with each patient being fully assessed in line with existing safety guidelines before they are moved.” Photo credit: Peter Manning/LNP