| Thamsanqa Jantjie gesticulates at his home during an interview with the Associated Press in Johannesburg, South Africa,Thursday, Dec. 12, 2013. Jantjie, the man accused of faking sign interpretation next to world leaders at Nelson Mandela's memorial, told a local newspaper that he was hallucinating and hearing voices. | 
     JOHANNESBURG     
(AP) -- The sign language interpreter at Nelson Mandela's memorial says 
he suffers from schizophrenia and hallucinated and saw angels while 
gesturing incoherently just 3 feet away from President Barack Obama and 
other world leaders, outraging deaf people worldwide who said his signs 
amounted to gibberish.
South African officials
 scrambled Thursday to explain how they came to hire the man and said 
they were investigating what vetting process, if any, he underwent for 
his security clearance.
"In the process, and in the speed of the event, a mistake happened," deputy Cabinet minister Hendrietta Bogopane-Zulu said.
She apologized to deaf people around the world who were offended by the incomprehensible signing.
However,
 she declined to say whether a government department, the presidency or 
the ruling African National Congress party was responsible for hiring 
the sign interpreter, telling reporters it isn't the time to "point 
fingers and vilify each other and start shouting."
The
 man at the center of the controversy said in an interview with The 
Associated Press on Thursday that he began hallucinating while onstage 
in the stadium filled with tens of thousands of people and that he tried
 not to panic because there were "armed policemen around me."
Thamsanqa
 Jantjie added that he has schizophrenia, was once hospitalized in a 
mental health facility for 19 months and has been violent in the past.
The
 disclosures raised serious security concerns for Obama, U.N. 
Secretary-General Ban Ki-moon and other dignitaries who stood next to 
Jantjie as they eulogized Mandela at FNB Stadium in Soweto, the black 
township at the center of the struggle against racist white rule. 
Mandela died on Dec. 5 at 95.
In Washington, 
Secret Service spokesman Ed Donovan said vetting for criminal history 
and other appropriate background checks of the people onstage were the 
responsibility of the South Africans. He added that Secret Service 
agents are "always in close proximity to the president."
White House Press Secretary Jay Carney declined to comment on how South Africa handled the hiring of the translator.
However,
 he added: "If in fact the individual was not signing, that's 
unfortunate because that meant that people who rely on sign language to 
follow the speeches were not able to."
Jantjie
 has been seen on video performing sign language interpretation at other
 prominent events in South Africa criticized as fake by advocates for 
the deaf, including at an appearance last December with South African 
President Jacob Zuma.
The government left many
 questions about the bizarre episode unanswered, including how much 
money the translation company was paid and Jantjie's precise role in the
 company - and even whether it really exists.
AP
 journalists who visited the address Jantjie provided for SA 
Interpreters found a different company, whose managers said they knew 
nothing about the translation firm. A woman who answered the phone at a 
number Jantjie provided said she worked for the company that hired him 
but declined comment and hung up.
The 
government said it tried to track down the company but the owners "have 
vanished into thin air," according to Bogopane-Zulu, the deputy minister
 of Women, Children and People with Disabilities.
She
 said the translation company offered sub-standard services and the rate
 they purportedly paid the translator, $77 a day, is far below the usual
 rate of up to $164 an hour.
Ordinarily, sign 
language interpreters in South Africa are switched every 20 minutes to 
maintain their concentration levels, she said. Jantjie was onstage for 
the entire service, which lasted more than four hours.
Jantjie,
 meanwhile, insisted he did proper sign language interpretation of the 
world leaders' speeches. But he also apologized for a performance 
dismissed by many experts as gibberish.
"I 
would like to tell everybody that if I've offended anyone, please, 
forgive me," Jantjie told the AP at his tidy home on the outskirts of 
Soweto that was outfitted with a big-screen TV in the living room and 
two late-model cars in the carport.
"What 
happened that day, I see angels come to the stadium ... I start 
realizing that the problem is here. And the problem, I don't know the 
attack of this problem, how will it comes. Sometimes I react violent. 
... Sometimes I will see things that chase me," he said.
"I
 was in a very difficult position," he added. "And remember those 
people, the president and everyone, they were armed, there was armed 
police around me. If I start panicking I'll start being a problem. I 
have to deal with this in a manner so that I mustn't embarrass my 
country."
Asked if he had ever been violent, he responded: "Yes, a lot."
He
 declined to provide details, but responded to another question about 
his past violence by suggesting his illness was behind it. "I'm 
suffering from a very difficult illness. The illness that you are not in
 position of understanding yourself at times."
Jantjie
 said that on the day of the memorial service he was due for a regular 
six-month mental health checkup to determine whether the medication he 
takes was working or needs to be changed, or whether he should enter a 
mental health facility for treatment.
He did not tell SA Interpreters that he was due for the checkup, but said an owner of the company was aware of his condition.
Police
 went to his home later Thursday to check on his well-being and 
determined that he was not a danger to himself or others, police 
spokesman Brigadier Neville Malila said.
A 
medical expert with University College London said Jantjie's unusual 
sign language didn't look like it was caused by schizophrenia or another
 psychosis.
"The disruption of sign language 
in people with schizophrenia takes many forms, but this does not look 
like anything I have seen in signers with psychosis," said Jo Atkinson, a
 clinical psychologist and researcher at the Center for Deafness, 
Cognition and Language.
Jantjie said he is 
officially classified as disabled by the government because of his 
schizophrenia. He said he has been on medication for nine years, and had
 taken it the day of the memorial service.
Jantjie
 said he received one year of sign language interpretation training, 
though advocates for the deaf say qualified interpreters in South Africa
 must undergo five years of training.