U.S. officials have identified a former CIA software engineer as the primary suspect in a massive leak of the spy agency’s documents last year. Joshua Adam Schulte, who designed computer code to spy on foreign adversaries for the CIA, is believed to have leaked thousands of documents last year revealing CIA programs and tools that are capable of hacking into both Apple and Android cellphones. WikiLeaks published the documents last March under the name “Vault 7,” calling it the largest leak of secret CIA documents in history. Prosecutors have not brought charges against Schulte for the leak despite months of investigation. However, in August, prosecutors indicted Schulte on child pornography charges that are unrelated to the leaks. He denies the charges.