Police have launched an investigation into allegations members of hip-hop star Sean Kingston's entourage cornered a club promoter in Hollywood on Wednesday night (04Jun14) and made off with his valuables. The Beautiful Girls hitmaker was booked to host and perform at the Avalon venue for a fee of $11,000 (£6,875). He received half of the payment upfront and was due to collect the rest of the cash after the show. However, the promoter clashed with Kingston's crew upon the star's arrival after he reportedly turned up three hours late. A group of Kingston's associates are said to have confronted the promoter and demanded the remainder of the singer's payment, and when he didn't hand over the money, the men allegedly stripped him of his watch, iPhone and cash. Cops were called to the scene but no arrests were made. The watch and cell phone were later recovered on the club grounds, but the money was not found, reports TMZ.com. The promoter, whose identity has yet to be released, told officers he was convinced Kingston orchestrated the attack, but he did not name the star in his subsequent police report. He did list Kingston's bodyguards as witnesses, but they have denied any involvement.