NICAP.org presents U.S. government UFO documents pertaining to the 9-10 March 1958 Panama Canal Zone UFO case.
The whole UFO case report:
This is an interesting uncorrelated target incident, supported by 17 Blue Book documents.
March 9-10, 1958; Panama Canal Zone
At around 2000 hours an unidentified object was picked up on search radar approaching the Pacific side of the Isthmus of Panama. At 2045 hours two additional blips were observed. These returns were transferred to track radar. During the period of observation the radar lock was broken, the equipment immediately picked up the target and locked on again. A second radar tracking station also locked onto the return. The manner of flight of the objects was steady, slightly circular path over the vicinity of Fort Kobbe, Canal Zone. There was such rapid movement of the object that it broke the lock of the track radar. It was assumed that these were solid objects as track radar can only be locked on a solid object. At 2400 hours, radar advised that as soon as a searchlight was employed the object became evasive. (Dan Wilson)”
If you compare the “AIR INTELLIGENCE INFORMATION REPORT” (“SUBJECT: Unidentified Flying Object Report”) (U.S. Air Force) document (580309panamacanalzone_docs.pdf) (Pages 4-10) with the Project Blue Book (U.S. Air Force) document (580309panamacanalzone_docs.pdf) (Pages 1-3) – you clearly see that PBB tries to explain away this UFO case.
Quote from the “AIR INTELLIGENCE INFORMATION REPORT” (“SUBJECT: Unidentified Flying Object Report”/“DATE OF REPORT: 18 March 1958”) document:
11:20 AF 5289 (T-33) airborne to check UFO. UFO was observed to avoid jet. As soon as jet got close, UFO appeared to move away for several miles, then stop.
12:00 Jet returned to Howard. Pilot called and advised nothing was seen. Also advised Weather Build-up. Radar advised they could distinguish UFO from clouds and build-ups.”
Map of Panama (lib.utexas.edu)