Pretoria - The police have warned against "Uhuru-type" e-mails, SMSs and a DVD claiming that former president Nelson Mandela's death will spark racial violence and attacks on white South Africans. The messages also "incite" white South Africans to gather at pre-identified "safe areas" and be prepared to defend themselves. The South African Police Service states emphatically that the messages are malicious, scurrilous and without any foundation or substance whatsoever. The messages refer to planning and intended actions under the code names of, among others, UHURU, Night of the Long Knives, Red October, Operation White Cleanup and Iron Eagle. 'Intended to incite hysteria' Police say the messages form part of a disinformation campaign and publicity stunt by a group known as the Suidlanders, under the leadership of one Gustav Muller. Police say the public should not pay any heed to the messages and not to let them influence their daily lives. They say the messages apparently are intended to incite racial intolerance and hysteria among South Africans.