Detroit Lions minicamp was interrupted by a scary moment on Tuesday when an unidentified man walked to the edge of the practice field and began berating players and reporters.

The man specifically targeted linebacker Tahir Whitehead, shouting, "Yo No. 59, I know you need me at linebacker." He also yelled that he had played football since 1987, and that he had created the game.

He also repeatedly shouted racial epithets at a reporter who was trying to capture his outburst.

The man accessed practice by walking through a side gate that was unlocked. He got within about 30 yards of players -- and owner Martha Firestone Ford was on the other side of the field -- before he was stopped by members of the public relations team. Security quickly followed and escorted the man away without further incident.

Allen Park police are currently investigating the incident, but declined to comment further.

Detroit was going through team drills at the time -- roughly 12:30 p.m. -- and most players said they didn't see it go down.