A white woman has lost her job after a video which showed her calling police to say she felt threatened by an African-American birdwatcher in New York's Central Park went viral.

Ms Cooper told the Harvard graduate she would phone police and tell them "there's an African-American man threatening my life" after he began filming her on his phone.

The video has been viewed more than 30 million times on social media, and the backlash prompted Ms Cooper's employer, global investment firm Franklin Templeton, to terminate her employment.

Mr Cooper's sister Melody Cooper, who posted the latest video, called the dog owner a 'Karen', slang used to describe a middle-aged white woman perceived to be entitled.

"Oh, when Karens take a walk with their dogs off leash in the famous Bramble [sic] in NY's Central Park, where it is clearly posted on signs that dogs MUST be leashed at all times, and someone like my brother (an avid birder) politely asks her to put her dog on the leash," Melody Cooper wrote.