(Reuters) – A New York boutique hotel on Monday said it was investigating how a recording of a security video that purportedly shows rapper Jay Z being attacked by his sister-in-law, R&B singer Solange Knowles, was leaked to a website. The video posted by celebrity website TMZ.com appears to show the 27-year-old Knowles, younger sister of Beyonce, charging and striking Jay Z several times in an elevator at the Standard Hotel in New York’s Meatpacking District before being restrained. Beyonce looks on in the three-and-a-half-minute video without audio, which quickly became an internet sensation, sparking several parody videos and photos.