The world watched in horror as SpaceX's Falcon 9 burst into flames on the Cape Canaveral launch pad during a routine check for its long awaited trip to space to launch a Facebook satellite earlier this week.

SpaceX CEO Elon Musk said the blast originated around the upper stage oxygen tank, but what caused it still remains a mystery.

However, conspiracy theorists have developed a different theory after seeing ‘an anomaly’ pass over at the same time as the blast and suggest an alien air strike sabotaged the mission.

Around 9am EST, the 604-ton rocket was being fueled with a concoction of liquid oxygen and rocket-grade kerosene propellant when the upper region burst into flames.

The entire craft was engulfed in what seemed like seconds, including Facebook’s $200 million communication satellite that was specifically designed to bring internet to Africa.

And although Falcon 9’s creators are baffled by the turn of events, a new theory has emerged that could provide answers.

Since the explosion, YouTube videos have been surfacing that highlight a mysterious anomaly passing over Falcon 9 as it sits on the launch pad before, during and after the explosion, Daily Express reported.

To read more and view the video, click here.