Prosecutors have convened a grand jury to investigate Noor Salman, wife of gunman Omar Mateen, news agencies said.
The wife of the gunman who killed 49 people at a gay nightclub in Orlando could face charges in connection with the attack, according to reports.
She is reported to have told police she tried to talk her husband out of attacking the Pulse nightclub. In other words she knew well in advance the attack which was carried out by her husband.
The attack in Florida was the worst mass shooting in recent US history.
Fifty-three people were wounded and six remain in a critical condition.