London, May 29 (ANI): Beyonce has beefed up security at her Twickenham stadium gig, amid fears of a British stalker.
Staff have been told to watch out for obsessed fan Bassey Essien when the R and B singer headlines the Sound Of Change concert on Saturday, the Sun reported.
It is believed that she has been sent sick threatening letters.
Essien has already been warned to stay away from Beyonce - who received an anti-harassment order in the High Court in 2011, prohibiting him from pestering her.
Court papers revealed Essien, of South West London, had been sending threatening letters to the star since 2009 and made a bizarre claim she was an imposter who had killed the real Beyonce.
"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. (ANI)