Twp mysterious 'explosions' in the early hours woke up residents across the Mercury patch, set off car and burglar alarms and knocked items from window sills. The bangs roused bemused householders from their slumber at around 3am and 3.30am on Monday. Residents in Stanstead Abbotts reported hearing the 'explosions' and it is thought some people in Ware heard the bangs. They emanated, however, several miles away in Hoddesdon, where several people saw a bright flash. Yesterday (Thursday, 19 October), as staff at Hailey Hall School in Hailey examined their seismograph to see if it recorded the incident, the cause of the bangs remained shrouded in mystery. Theories abounded, with fireworks, a power station, guns and even supersonic aircraft blamed for disrupting the night peace and setting off alarms.