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Gift of the Givers founder Imtiaaz Sooliman says all they can do is wait, as times runs out for South African Pierre Korkie, who has been held hostage in Yemen since May last year.
Pierre's wife Yolande made an eleventh hour plea to Al-qaeda on Thursday asking them to not kill her husband.
The kidnappers have said they would execute him if the more than 30 million rand ransom is not delivered by Saturday.
Sooliman says he hopes that someone in Yemen will contact them following Yolande's filmed appeal.
