CNN reports: Federal investigators digging for clues in the Orlando nightclub massacre are zeroing in on Noor Salman, the widow of gunman Omar Mateen. What did Salman know of his plans and what might she have done to stop him? Authorities have been trying to pin her down after she apparently gave conflicting statements about what she knew of his intentions in the hours before the attack. A U.S. attorney plans to bring evidence before a federal grand jury to determine whether charges will be brought, according to two law enforcement officials. The process could take some time, as investigators need to finish collecting evidence and establish a timeline for Mateen’s activities leading to Sunday’s attack at the gay club Pulse, in which 49 people were killed, the officials said. What did the wife know? Salman, Mateen’s second wife, has been cooperating with various law enforcement agencies. Salman told investigators that Mateen told her he had interest in carrying out a jihadist attack — but she denied knowing of any specific plans, according to two law enforcement officials. She initially denied that when Mateen left the house Saturday that she had any idea he was going to do something violent.