Countering the narrative of radical extremism continues to be a challenge for the government, Lynch said.
“How do we break that chain? How do we counter this extremist ideology that’s online, knowing that the internet has to remain free and open?” she said. “What can we get out there that’s a counter-message to that?”
At the scene of the carnage, workers removed a temporary fence that was erected around the Pulse nightclub.
State officials wondered how they would pay for resources drained by the June 12 massacre, and investigators kept probing for gunman Omar Mateen’s motives for the rampage, in which 49 people were killed and dozens more wounded. Mateen died in a gun battle with police.
Lynch said investigators may never pinpoint a single motive and have not ruled out witness reports suggesting Mateen might have been at Pulse before or had gay interests.
“While we know a lot more about him in terms of who he was and what he did, I do not want to definitively rule out any particular motivation here,” she said, later adding, “It’s entirely possible that he had a singular motive. It’s entirely possible that he had a dual motive.”
In a 911 call from the club, Mateen pledged solidarity with the Islamic State group, and Lynch said there’s no doubt, based on evidence gathered during the investigation, that he had read and absorbed extremist propaganda on the internet.
“We believe that is certainly one avenue of radicalisation, but we want to know if there are others,” she said. “We want to know everything he did in the days, weeks and months leading up to this attack.”
“We still do believe that this was an act of terror and an act of hate,” she added.
She called the rampage a “shattering attack — on our nation, on our people and on our most fundamental ideals”.
Lynch’s meeting with first responders came as Orlando police faced continued questions about their response.
On Monday, police chief John Mina said that if any fire from responding officers hit victims at the club, Mateen bears the responsibility. “Those killings are on the suspect, on the suspect alone in my mind,” he said.
More clues emerged about the attack when the FBI released a partial transcript of phone calls Mateen had with a 911 operator and police crisis negotiators once the shooting got under way.
In them, he identified himself as an Islamic soldier, demanded that the US “stop bombing” Syria and Iraq, warned of future violence and at one point pledged allegiance to Abu Bakr al-Baghdadi, the leader of the Islamic State group, the FBI said.
Mateen’s calls to police, which one FBI official said were made in a “chilling, calm and deliberate manner” were similar to postings he apparently made on Facebook around the time of the shooting.