Well Yonhap claimed they knew, but Robert Park says that he never made any such claims to the Yonhap reporter:

Robert Park cried out in torment as you spoke on the phone from Seoul about what he had endured – not at the hands of the North Koreans who held him for 43 days after he crossed the frozen Tumen River into North Korea on Christmas Day, 2009, but about a South Korean report claiming to quote him on what he had endured.

The article carried by Yonhap, the South Korean news agency, purporting to quote his remarks about the sexual torture inflicted on him, is “fabrication”, he said, demanding “retraction” and accusing Yonhap of “corruption” for having run the story without his approval.

Just what happened to the 31-year-old crusader after he entered North Korea bearing a message of “God’s love” for North Korea’s late leader Kim Jong-il is not clear. What is known is that, when he was packed off to Beijing on an Air Koryo flight and released into the hands of an American diplomat, he was a broken man.

He’s still not saying exactly what got the North Koreans to say, before his release two years ago, on February 9, 2010, that he had “seriously repented of the wrong I committed, taken in by the West’s false propaganda”. Whatever it was, he’s been confined off and on to mental hospitals in Long Beach, California, and his native Tucson, Arizona, and lives in constant mental agony.

Gradually, however, Park is recovering to the point at which he can muster the strength and concentration to crusade full-time against what he says is the “genocide” committed by North Korea’s leaders against their own people. At the same time, he’s resolved to sue in the United States against North Korea for the “torture” inflicted on him – and hopes to recover funds from North Korean overseas accounts that he can then dedicate to his crusade.

But what did the North Koreans really do to him?

Park, often reluctant to talk to journalists, exploded in our conversation while talking about the Yonhap report quoting him as saying North Korean women had “surrounded me and did the worst thing to me to try to make me commit suicide”. The report said he had described how the women “beat his genitals with a club to ‘make me not to have a baby and get married forever’.”

One of the women mocked his evangelical Christian faith while he was suffering under the glare of a bright light, according to the Yonhap story, asking, “If your God is so great, why doesn’t he save you?”   [Asia Times]

You can read more at the link as well as over at Three Wise Monkeys who have a posting up on this topic as well.

It has been claimed that Robert Park was given a brain altering drug cocktail which may explain his current mental state, however I think Park was probably a little unstable before he was detained by North Korea.  Anyone that would willing walk into North Korea to be detained has to be a little unstable.