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.