Tehran was an "incident" while Belgium experienced multiple incidents, a "flap."
Most notable about Tehran was the electromagnetic interference caused by the object. Do "lights in the sky" cause such things?
IMO, misidentified planets, incompetence and equipment failure are all too often profered as explanations.
Belgium is interesting in that multiple eyewitnesses, if they're to be believed, saw objects, triangular craft, not just "lights in the sky."

These are a couple of interesting cases, to be sure.

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