Former US President Barack Obama has clarified that the chances Earth has been visited by aliens is "low" after comments he made about extra-terrestrial species caught attention online.
"They're real but I haven't seen them," he told American podcast host Brian Tyler Cohen during an interview published on Saturday.
"They're not being kept in Area 51. There's no underground facility unless there's this enormous conspiracy and they hid it from the president of the United States," he added.
Obama has since said his comments were made in line with "the spirit of the speed round" of questions, adding that statistically the chances are that life is out there but he saw "no evidence" while president.
Obama's initial comments were made during a quickfire "lightning" round of questions.
