Los Angeles, May 29 (IANS) Beyonce Knowles' security guards have reportedly been asked to watch out for obsessed fan Bassey Essien when the singer headlines Sound of Change concert Saturday.
Essien, who had been sending threatening letters to the singer since 2009, has been warned to stay away from the 31-year-old star, thesun.co.uk reports.
Knowles had also won an anti-harassment order in court in 2011, prohibiting him from troubling her.
"Staff have been briefed on the situation and pictures of him have been passed round. They've been told to keep their eyes open and be extra vigilant," a source said.
"Security has been increased on a few engagements now, especially for her (British) promo. It is believed similar letters to the ones that Essien sent have been received," he added.