An urgent appeal for blood donors has been issued following a ransomware attack on London's NHS hospitals, attributed to a Russian cybercriminal group. The attack disrupted operations and caused cancellations of procedures and blood transfusions. NHS Blood and Transplant urgently seeks O positive and O negative blood donors to replenish stocks. Medical students have been asked to volunteer for long shifts to support hospitals during this crisis. The NHS is working to minimise disruption and advises patients to attend appointments unless contacted otherwise. We pray for swift recovery and resilience for the NHS amidst this cyberattack.