Actor Dan Aykroyd is convinced alien life forms refuse to make contact with the human race because we are seen as a "violent, depraved, disgusting species".

The Blues Brothers star is a keen student of extraterrestrial sightings and is adamant he has encountered UFOs on several occasions in the U.S.

He even insists he saw two suspicious objects in the sky as the horrors of the 2001 attack on the World Trade Center in New York were unfolding, and believes that sighting gives a clue as to why aliens have not made contact with humans.

Aykroyd tells The Sunday Times Magazine, "(It's) because we are a violent species. They don't want anything to do with us. They watch us. There were two white orbs over (New) Jersey when the second tower went down on 9/11. They were on CNN for about two minutes... They never showed it again.

"Can you imagine what was going through their advanced minds when they saw what happened on 9/11? These humans crashing our highest evolution in aviation into our highest evolution in architecture and metallurgy, like kids wrecking toys in the sandbox. They are disgusted with us. And rightly so. Because we are a depraved, disgusting species."