The wife of Orlando nightclub gunman Omar Mateen faces a court hearing in California after being arrested there in connection with his Florida shooting rampage that left 49 people dead.
Noor Salman, 30, is scheduled to make an initial appearance in federal court on Tuesday morning in Oakland, following her arrest a day earlier on Florida charges that authorities said include obstruction of justice and providing material support to a foreign terrorist organisation.
Salman is from the San Francisco Bay Area and in the aftermath of the Orlando attack that also left her husband dead she returned here with their son, whose name she has since sought to change.
She had been repeatedly questioned by FBI investigators over whether she had any knowledge of her husband's plans.
Her lawyer Linda Moreno said after her arrest she "had no foreknowledge nor could she predict what Omar Mateen intended to do that tragic night".
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Salman knew her husband had watched jihadist videos but was "unaware of everything" regarding his intent to shoot up the club, Salman said in a New York Times interview published in November.
Salman also said he had physically abused her, which her attorney reiterated on Monday.
"Noor has told her story of abuse at his hands," Moreno said.
"We believe it is misguided and wrong to prosecute her and that it dishonours the memories of the victims to punish an innocent person."
The San Francisco office of the FBI said Salman was taken into custody Monday morning in Rodeo, which is the small Bay Area community where she grew up and where her family lives.
Jail records, however, say she was arrested about 50km away in Dublin. The reason for the discrepancy was not clear.
US Attorney-General Loretta Lynch said in a Monday interview with MSNBC that "from the beginning, we were going to look at every aspect of this, of every aspect of this shooter's life to determine not just why did he take these actions - but who else knew about them? Was anyone else involved?"
Salman met Mateen online and the two married in 2011.
They lived in Fort Pierce, Florida, at the time of the shooting.
Mateen pledged allegiance to the Islamic State group in an emergency call during the three-hour stand-off that ended in his death.
Forty-nine patrons were killed and another 53 were hospitalised.
