Deaf organisations have complained after the man translating the speeches at Nelson Mandela's memorial service 'signed gibberish'.
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Former South African president FW de Klerk has said spoken of his sadness at the death of Nelson Mandela after seeing his body lying in state in Pretoria.
He told ITV News' Africa Correspondent Rohit Kachroo: "I'm very sad. Yesterday was a day for celebration. Today is a day for mourning."
Asked how it felt to see Mandela, he said: "It touched my heart deep."
The gestures of a man who was supposed to be interpreting the Mandela memorial for deaf viewers was "talking gibberish", according to the principal of a Johannesburg school for the deaf.
Ingrid Parken said she had to leave the room because she was so disgusted by what she saw during the service.
Spoke to FW de Klerk as he emerged from Mandela lying in state. "I'm very sad... It touched heart deeply"
Video posted online appears to show the man accused of 'faking' sign language during Nelson Mandela's memorial 'interpreting' for South African president Jacob Zuma last year.
The footage, apparently filmed in January 2012 at the ANC party's 100th anniversary, shows the man making gestures as Zuma sings to the crowd.
ANC communications manager Keith Khoza told NBC News that the interpreter had translated for party events in the past, but said that the man only “volunteered” and was not paid.
The mystery of a man who was reportedly gesticulating gibberish during the memorial to Nelson Mandela has deepened as no authorities connected with the event claim they do not to know who he is.
The government, which was officially in charge of the ceremony said it had tried and failed to get to the bottom of the matter:
"Government is looking in to this matter but has not been able to conclude this inquiry due to the demanding schedule of organising events," Presidency Minister Collins Chabane told a news conference.
Jacob Zuma's spokesman Mac Maharaj said he was checking the reports, while the SABC state broadcaster, which covered the memorial, said it was not involved as it had its own on-screen signers.
The ruling African National Congress (ANC) also professed no knowledge, even though several television clips from a big party meeting a year ago showed the same man gesticulating on stage alongside Zuma.
"I don't know this guy. He doesn't work for the ANC. It was a government event. Ask them," spokesman Jackson Mthembu said.
– Delphin Hlungwane, an official sign language interpreter at DeafSA
He was basically gesturing. He didn't follow any of the grammatical rules and structure of the language. He just invented his signs as he went along.
There was zero percent accuracy. He couldn't even get the basics right. He couldn't even say 'thank you'.
Hlungwane said the interpreter also failed to impart to television viewers - as he should have done - that the crowd gave a hostile reception to Jacob Zuma.
"You're supposed to indicate with your facial expressions, even if it's not an exact sign," she said. "He didn't indicate that at all. It just passed him by."