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In this picture taken on December 10, 2013 US President Barack Obama delivers a speech next to a sign language interpreter (R) during the memorial service for late South African President Nelson Mandela at Soccer City Stadium in Johannesburg. South Africa's deaf community on December 11, 2013 accused the sign language interpreter at Nelson Mandela's memorial of being a fake, who had merely flapped his arms around during speeches. Mandela, the revered icon of the anti-apartheid struggle in South Africa and one of the towering political figures of the 20th century, died in Johannesburg on December 5 at age 95. AFP PHOTO / ALEXANDER JOE (Photo credit should read ALEXANDER JOE/AFP/Getty Images)
In this picture taken on December 10, 2013 US President Barack Obama delivers a speech next to a sign language interpreter (R) during the memorial service for late South African President Nelson Mandela at Soccer City Stadium in Johannesburg. South Africa's deaf community on December 11, 2013 accused the sign language interpreter at Nelson Mandela's memorial of being a fake, who had merely flapped his arms around during speeches. Mandela, the revered icon of the anti-apartheid struggle in South Africa and one of the towering political figures of the 20th century, died in Johannesburg on December 5 at age 95. AFP PHOTO / ALEXANDER JOE (Photo credit should read ALEXANDER JOE/AFP/Getty Images)

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Questions surround memorial interpreter

The Deaf Federation of South Africa wants to know who vetted the sign language interpreter for Nelson Mandela's memorial.

Questions surround memorial interpreter

The Deaf Federation of South Africa wants to know who vetted the sign language interpreter for Nelson Mandela's memorial.