Morgan Wallen: US radio stations drop country star over racial slur

US country music star Morgan Wallen has been removed from more than 400 US radio playlists after a video emerged of him using a racial slur.

In the footage, reportedly filmed by a neighbour last weekend, the 27-year-old is seen saying goodbye to some friends and calling one of them the N-word.

The Nashville star, whose latest album has been number one in the US for the past three weeks, has apologised.

"I'm embarrassed and sorry," he told TMZ, which first published the video.

"I used an unacceptable and inappropriate racial slur that I wish I could take back. There are no excuses to use this type of language, ever. I want to sincerely apologize for using the word. I promise to do better."

Wallen, whose career began on the US version of TV talent show The Voice, is currently one of the biggest country stars in the US.

His latest record, Dangerous: The Double Album, is the first country record to spend three weeks at number one on the Billboard chart since Taylor Swift's Red in 2012.