The heavily armed teenager, who gunned down students and adults at a Florida high school, was charged Thursday with 17 counts of premeditated murder, court documents showed.

Nikolas Cruz, 19, killed fifteen people in a hail of gunfire at Marjory Stoneman Douglas High School in Parkland, Florida.

Two others died of their wounds later in hospital, the sheriff’s office said.

The F.B.I. on Thursday said it received information about a comment made on a YouTube channel which has been attributed to the gunman, but were unable to identify the person.

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Governor Rick Scott of Florida said he would meet with state lawmakers to secure more funding for school safety and the treatment of mental illness.“If we have somebody that’s mentally ill, they can’t have access to a gun,” Mr. Scott said.

The authorities said the AR-15 rifle that Mr. Cruz used in the attack was purchased legally. “No laws were violated in the procurement of this weapon,” said Peter J. Forcelli, the special agent in charge for the Bureau of Alcohol, Tobacco, Firearms and Explosives in Miami.

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