The US National Security Agency is in damage control after the arrest of one of its contractors for allegedly stealing vital intelligence information. The FBI has charged Harold T Martin with stealing high level documents, some which detailed a hacking tool that the NSA used to break into foreign computer systems. This information turned up on the internet earlier this year. Martin worked for Booz Allen Hamilton, the company that Edward Snowden was with before he fled to Russia with a trove of top-secret intelligence documents.