Jay Z's former business partner has filed documents demanding full custody of 15 year old Ava and six year old Tallulah following his divorce from the fashion designer in 2009.

In the documents, obtained by TMZ.com, Dash alleges Roy threatened him with a knife, drove under the influence of alcohol, and clashed with one of the children.

He also accuses her of stealing two diamond chains worth $10,000 (£6,250) each and a designer suitcase, worth $5,000 (£3,125).

Roy had not responded to the allegations as WENN went to press.