Two fighter pilots who tried to shoot down UFOs found the alien invaders indestructible, according to a TV shock doc.

One said he unleashed a wall of fire" that would "normally obliterate anything in its path" against a mystery craft.

But the UFO just absorbed’ every missile he shot at it, out-manoeuvred his jet in a 50-mile chase - then flew off apparently undamaged.

Another pilot who tried to blast a craft out of the sky with a heat-seeker in a separate close encounter 8,000 miles away found all his jet’s controls had frozen. They only started working again once the UFO had vanished.

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