Scores of UFO enthusiasts converged on rural Nevada on Thursday for a pilgrimage of sorts to the U.S. installation known as Area 51, long rumored to house government secrets about alien life, as law enforcement officials beefed up security around the military base.

Visitors descended early in the day on the tiny desert town of Rachel, a short distance from the military site, in response to a recent, viral social-media invitation to "storm" Area 51 on Friday, raising concerns by local authorities of unruly crowds overwhelming the community.

Situated about 150 miles (240 km) north of Las Vegas, the remote hamlet of just 50 year-round residents lacks a grocery store or even a gasoline station.