No motive has been announced. A suicide note was found expressing grievances with the NFL and saying Tamura suffered from CTE, a source said. Follow for live updates.

Two teams of detectives were sent to Las Vegas to execute a search warrant on the shooter's home and investigate the weapons used in the attack. Investigators discovered that parts of the automatic weapon had been purchased by someone else, raising questions about potential assistance in the crime.

The shooter behind a deadly rampage inside an office building in Midtown Manhattan on Monday evening was apparently targeting NFL offices there, New York City Mayor Eric Adams said Tuesday morning.Law enforcement sources say investigators recovered a three-page rambling note from gunman Shane Tamura's wallet in which he referenced the brain disease CTE.