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The wife of 29-year-old Omar Mateen, who gunned down 49 people at a gay club in Orlando, knew of his plans for the attack.
She could be charged in connection with the mass shooting, a law enforcement source said on Tuesday.
Reportedly, a federal grand jury had been convened and they could charge Noor Salman as early as Wednesday.
ALSO READ: Orlando Shooter A Lone Actor Influenced By ISIS, Says Barack Obama
Member of the Senate Intelligence Committee, US Senator Angus King, told CNN "It appears she had some knowledge of what was going on."
He further added, "She definitely is, I guess you would say, a person of interest right now and appears to be cooperating and can provide us with some important information."
Omar Mateen was a lone actor influenced by the ideologies of Islamic State militant group, US President Barack Obama said on Tuesday.
ALSO READ | Orlando Shooting: Gunman Omar Mateen Visited Nightclub Several Times Before Attack
"Terrorist groups like ISIL have called on people around the world and here in the United States to attack innocent civilians. Their propaganda, their videos, their postings are pervasive and more easily accessible than we want," Obama said at the Treasury Department after his meeting with his national security team.
Mateen killed 49 people and wounded another 53 before he was killed when police stormed the Pulse, one of Orlando's most prominent gay venues, on Sunday.
Obama said that the government is doing everything it could to stop these kinds of attacks.
"But across our government at every level, federal, state and local, military and civilian, we are doing everything in our power to stop these kinds of attacks. We work to succeed 100 percent of the time. An attacker, as we saw in Orlando, only has to succeed once," he said.