Orlando killer's wife may also be charged, prosecution says she was aware of the attack
investigators says she took him to buy ammunition and drove him to survey the nightclub
The wife of Omar Mateen, the gunmen who killed 49 people at gay nightclub in Orlando could also be charged.
Prosecutors have convened a grand jury to investigate Noor Salman, in connection with the attack. Prosecutors now thinks Noor Salaman was aware of the attack, Reuters said in a report.
She is reported to have told police she tried to talk her husband out of attacking the Pulse night club.
Prosecutors said they were seeking to charge Noor Salman for her failure to warn authorities about the impending attack, Fox News said in a broadcast.
Police has been questioning Noor Salman, but has not arrested her so far.
US Senator Angus King, a member of the Senate Intelligence Committee reported that "it appears she had some knowledge of what was going on".
"She definitely is, I guess you would say, a person of interest right now and appears to be co-operating and can provide us with some important information," he told CNN.
There were reports that Noor Salman had gone with Omar Mateen to buy ammunition and had taken him to the nightclub to survey it on earlier occasions.
Meanwhile the police has so far not established any link between Mateen and other external organisations.
Mateen was born in New York after his parents migrated from Afghanistan.
Mateen 's ex-wife, Sitora Yusufiy, had said that he was short tempered, abusive and violent.
Yusufiy told CNN that she wouldn't be surprised to learn that Mateen could have been living a double life in deep internal conflict.
"So, I just hope that people, without making rash judgments on one another, can truly understand that this is one insane person that did such a tragic thing," Yusufiy said.