There were several military radars that showed the entire event, including one that showed two blips, possibly three, of a mach 2 object coming toward and intersecting the TWA-800 aircraft. These military radar would show not only distance and direction, but also altitude, not relying on transponder returns for that data. ALL of these military radar recordings were immediately sent to the White House and were never seen again.
There was also DSP data. It wasn’t fully analyzed until days later.
BTW, those “recording” were copies. The originals stayed on site. Any federal investigator could have had access but were also denied.