(CNN) -- Adrian Lamo, the former computer hacker who tipped off federal authorities to WikiLeaks suspect Bradley Manning, says two men in the Boston area have told Lamo in phone conversations that they assisted Manning. Lamo said both men attend the Massachusetts Institute of Technology, but he refused to identify them because, he said, at least one of them has threatened him. One of these men allegedly told Lamo they gave encryption software to Manning and taught the Army private how to use it, Lamo said. Manning, an Army intelligence analyst, is being held in solitary confinement at a Virginia...