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FBI Says It Investigated YouTube Threat After Receiving a Tip but Couldn’t Link It to Individual.

The FBI was warned in September about a possible school shooting threat from a YouTube user with the same name as the suspect in Wednesday's campus massacre in Parkland, Florida, according to a video blogger.

Ben Bennight, the 36-year-old YouTube video blogger from Mississippi, noticed in September an alarming comment on a video he'd posted. He told CNN he immediately contacted the FBI.

"Im going to be a professional school shooter," read the comment, left by a user with the name Nikolas Cruz, the same name of the suspected shooter who opened fire at Marjory Stoneman Douglas High School on Wednesday, killing at least 17 people.

It was one of at least two alleged threat reports about the suspected shooter that the FBI received, according to a law enforcement official. In both cases, the FBI did not share the information with local law enforcement, the official said.

Bennight emailed a screenshot of the comment, which he shared with CNN, to what he thought was an FBI tip line, but the email address was invalid, he said. Bennight said he followed up with a phone call to the FBI. The comment on YouTube has since been pulled down.

According to Bennight, agents from the FBI's field office in Mississippi contacted him and came to his office to conduct an in-person interview the next morning. Bennight told the agents he didn't know anything about the user, he told CNN.

That was the last contact he had with the FBI until Wednesday, he said.

The FBI special agent in charge of the Miami division, Robert Lasky, confirmed Thursday morning that the bureau received a tip last year about the YouTube comment.

"No other information was included with that comment which would indicate a time, location or the true identity of the person who made the comment," Lasky said during a news conference. "The FBI conducted database reviews, checks but was unable to further identify the person who actually made the comment."

It's not clear whether the FBI ever identified the suspect in the other alleged threat report.