Show London Air Sirens End Long Quiet LONDON Dec 19 WP Lon UP-Lon- Lon Londoners doners heard air raid sirens shrilling shrilling shrill shrill- ing early Thursday evening for forthe forthe forthe the first time In three nights Tuesday and Wednesday nights were quiet Officials noted just before the warning sounded that this was the third consecutive day in which virtually no bombs fell feIl on Britain N Immediately after the alarm sounded gunfire was heard Inthe in inthe inthe the outskirts of the capital The warning ended a quiet period of about 68 hours houts the longest since the intensive nazi raids started in September |