Pantex Plant unidentified object incident

Case

Overview

Pantex ground-surveillance radar detected an unidentified object moving north west of the plant. Protective Force personnel subsequently visually tracked it; a DOE-released incident report documents the security response.

Investigative phases

Radar alert at about 07:10; Protective Force vehicle pursuit and binocular observation; internal review; September 2 incident report; subsequent DOE FOIA release.

Reported phenomena

Small object reported as diamond-shaped; no audible sound or identifiable propulsion in binocular observations; initial reported movement approximately 10–15 mph; apparent later change of direction and speed.

Public evidence status

HIGH for existence of a contemporary government incident report and reported radar/security observations; original sensor data and imagery are not established as publicly available.

Alternative explanations / caveats

A small unmanned aerial system, balloon or other ordinary airborne object cannot be excluded. Security response under UAS procedures does not prove identification as a drone. No substantiated nonhuman origin or unusual performance.

Next research tasks

Obtain original radar track, photographs/video and metadata if releasable; establish dimensions, altitude, wind and trajectory; determine FBI follow-up outcome.

Last reviewed

2026-11-01

Assessment

Event date

2015-09-01

Source category

Contemporaneous official security incident report

Original data accessibility

Report publicly released; raw radar and imagery not independently available

Witness / instrument basis

Radar alert plus direct visual tracking by protective force

Corroboration limitations

Unreleased original sensor records, limited geometry, unknown identity

Extraordinary claim assessment

Unidentified object reported; no public proof of extraordinary capabilities or origin

Current status

Documented security incident; identification unresolved

Priority research task

Seek radar tracks, images, witness records and FBI outcome

Lead source ID

SRC-132

Evidence (2)

• Ground Surveillance Radar reported unknown northbound object west of Pantex around 07:10 Documented
  CE-151 · 2015-09-01 · Contemporaneous government incident report / reported radar observation
  Gaps: Raw radar tracks, range, altitude and calibration not publicly verified
• Protective Force lieutenant and security police officer followed object; noted no sound or identifiable propulsion; later lost it north of facility Claim unverified
  CE-152 · 2015-09-01 · Contemporaneous official report / attributed firsthand observation
  Gaps: Visual estimates uncertain; no publicly verified object measurements

Documents gathered (2 lines of evidence)

2 readable here · 0 with a linked primary record · 0 still need a document · All cases on the evidence map

• Ground Surveillance Radar reported unknown northbound object west of Pantex around 07:10 Readable here
  CE-151 · Pantex Unidentified Object Incident Report (read here)
• Protective Force lieutenant and security police officer followed object; noted no sound or identifiable propulsion; later lost it north of facility Readable here
  CE-152 · Pantex Unidentified Object Incident Report (read here)

On the timeline (1)

• 2015-09-01 Pantex radar detection and protective-force visual tracking Documented
  Official incident report; object unidentified, ordinary explanations remain viable