A security researcher involved with the Wikileaks Web site was detained by U.S. agents at the border for three hours and questioned about the controversial whistleblower project as he entered the country on Thursday to attend a hacker conference, sources said on Saturday.

He was also approached by two FBI agents at the Defcon conference after his presentation on Saturday afternoon about the Tor Project.

Jacob Appelbaum, a Seattle-based programmer for the online privacy protection project called Tor, arrived at the Newark, New Jersey, airport from Holland flight Thursday morning when he was pulled aside by customs and border protection agents who told him he was randomly selected for a security search, according to the sources familiar with the matter who asked to remain anonymous. More>>