UFO enthusiasts gather outside Area 51 in the US

Turnout outside top-secret military base falls short of expectations but one person is arrested for trespassing.

It started as an online joke that quickly went viral. Millions of people signed up to “storm” a top-secret US military base, which has long been the subject of alien conspiracy theories.

But, as Al Jazeera’s Heidi Zhou-Castro reports, only a few dozen UFO enthusiasts ended up gathering at the gates of Area 51.