Noor Salman, Omar Mateen’s wife, told the FBI her husband had wanted to carry out a terror attack, but denied she knew he planned to carry out a mass shooting, a law enforcement official said Tuesday.

However, FBI investigators say that Noor Salman was not a co-conspirator in the attack that killed 49 people Sunday morning at a nightclub, the source said.

“It appears she had some knowledge of what was going on,” said US Senator Angus King, a member of the Senate Intelligence Committee, which received a briefing on the attack on Tuesday.

“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 on who this guy is, what his motivations were and what his plans were,” King told CNN.

Armed with assault weapons, Mateen stormed the Pulse Club on Sunday, killing 49 people and injuring 53 others at the club, marking the worst ever mass shooting in US history.

Mateen, a US citizen of Afghan descent, was as an alleged Daesh (ISIS / ISIL) sympathizer.

The incident sparked fierce public debate and many US officials expressed their views on the massacre. Among the latest was Democratic presidential candidate Senator Bernie Sanders, who lashed out at those who blame Islam for the shooting.

US President Barack Obama described the mass shooting as an act of homegrown extremism, while at the same time calling for stricter gun laws in America.

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