65 HS1-834228961 62-HQ-83894 Section 006

copy; bw FEDERAL BUREAU OF INVESTIGATION U.S. DEPARTMENT OF JUSTICE COMMUNICATIONS SECTION OCT 13 1950 TELETYPE SAC, KNOXVILLE 10-13-50 8-26 PM JYC DIRECTOR, FBI URGENT Flying Saucers RADAR DETECTION OF UNIDENTIFIED OBJECTS OVER OAK RIDGE OCTOBER TWELVE, NINETEEN FIFTY, PROTECTION OF VITAL INSTALLATIONS. USAF RADAR INSTALL- ATION AT KNOXVILLE AT ELEVEN TWENTYFIVE PM, EST, OCTOBER TWELVE, PICKED UP INDICATIONS OF ELEVEN OBJECTS AND PERHAPS MORE TRAVELING ACROSS CONTROLLED AREA OF ATOMIC ENERGY INSTALLATION AT OAK RIDGE. ALTITUDE OF OBJECTS VARIED FROM ONE THOUSAND TO FIVE THOUSAND FEET, COURSES FROM SOUTH SOUTH EAST TO SOUTHEAST, AND DENSITY FROM READING MADE BY LIGHT AIRCRAFT TO AIRCRAFT EQUAL IN SIZE TO C FORTY SEVEN, SPEED FROM ONE HUNDRED TO ONE HUNDRED TWENTYFIVE MILES PER HOUR. FIGHTER PLANE ATTEMPTED TO INTERCEPT IN FEW MINUTES AND RADAR SCREEN REFLECTED CONTACT, BUT PLANE REPORTED NO OBJECT COULD BE SEEN EITHER VISUALLY OR ON PLANES RADAR SCREEN. AEC PATROL WAS ALERTED BUT NO OBJECTS COULD BE VISUALLY SIGHTED BY THEM OVER THE AREA OTHER THAN THE AIR FORCE INTERCEPTOR. OSI AND EASTERN AIR DEFENSE FORCES HAVE BEEN ADVISED AND ARE CHECKING INCIDENT. NO REASONABLE EXPLANATION FOR RADAR READINGS YET DEVELOPED ALTHOUGH OPERATORS ARE EXPERIENCED RELIABLE PERSONNEL AND RADAR SET IS IN PERFECT OPERATING CONDITION. BUREAU WILL BE ADVISED OF FURTHER DEVELOPMENTS. ROBEY ACK AND HOLD PLS 8-31 PM OK FBI WASH DC GAR [illegible] NOT FILED 9 1950 NOV 22 INDEXED - 15 62-83894-261 INITIALS ON ORIGIN 55 DEC 7 1950