Did aliens attack the earth? Well, at least many residents of California were very sure.

On Friday (December 22) night residents across Southern California and as far away as Phoenix, Arizona saw a mysterious light dazzling the sky and mistook it as UFO.

People on the highways in Los Angeles stopped their cars to take videos and photos and it left everyone in frenzy, reports the Indian Express.

However, it was not a UFO but a rocket. Yes, SpaceX launched their reused rocket carrying 10 satellites into orbit from California, and it created a mysterious trail on the sky.

The Falcon 9 booster lifted off from coastal Vandenberg Air Force Base, carrying the latest batch of satellites for Iridium Communications.

The billowing streak that was widely seen throughout Southern California set off frantic calls to TV stations.

The hullabaloo was so heightened that the Los Angeles Fire Department issued an advisory that the ‘mysterious light in the sky’ was from the rocket launch.

Twitter was flooded with photos and videos and while adults thought it was alien, some little ones thought it might have been Santa out to deliver gifts before Christmas.

And if all these were not enough, SpaceX CEO Elon Musk made a joke about the mysterious light being ‘Nuclear alien UFO from North Korea’. And Demi Lovato too ruled it as UFO!