The hotel where it is claimed a fight broke out between Jay Z and his sister-in-law Solange Knowles has said it is "disappointed" a video has been leaked.

A statement from The Standard Hotel in New York confirmed it was investigating how footage from a lift was released.

"We are shocked and disappointed that there was a breach of our security system and confidentiality we count on providing our guests," it said.

Beyonce's management has declined to comment on the story so far.

The video was released by celebrity gossip site TMZ.

It says that the footage is of Jay Z, Beyonce and her sister Solange Knowles and claims there is a physical argument going on in a lift.

It's thought the incident happened after the three had attended the Met Gala Ball last week in New York.

The hotel added: "We are investigating with the utmost urgency the circumstances surrounding the situation and, as is our customary practice, will discipline the individuals involved to our fullest capacity."

The Standard, High Line, is an 18-story boutique hotel located in Manhattan's Meatpacking District.

The chain also has hotels in Los Angeles and Miami Beach, Florida.

Newsbeat has contacted Jay Z's management but so far no-one has returned the emails.

Solange is Beyonce's younger sister and is a singer-songwriter in her own right.

The 27-year-old recently performed at Coachella music festival in the US, where Beyonce joined her on stage for a surprise guest appearance.