The article underneath has appeared in the New York Times on July 22, 1952.
STRANGE OBJECTS IN US SKY
OBSERVATION BY RADAR
FROM OUR OWN CORRESPONDENT
WASHINGTON, JULY 22
United States Air Force officials, who have been checking the may recent reports of "flying saucers" submitted to them from various parts of the country, are to-day investigating reports that seven to 10 "unidentified aerial objects" were noted on radar screens here early on Sunday morning. These objects appeared to be over Andrews Air Force base, in Maryland.
The Air Force announced last night that the objects had appeared on the radar screen in the air route traffic control centre at the National Airport, first on one section of the screen, and then, soon afterwards, on another section, which showed them moving in a different direction. Their speed was only 100 to 135 miles an hour, which is very slow for "flying saucers." One pilot watched the objects for about 12 minutes as he flew from Washington to Martinsburg, in West Virginia. Another pilot reported that a brilliant light had followed his aircraft from Herndon, in Virginia to within four miles of the National Airport.
Here is another article about those important events.