ENGLEWOOD, Colo. (AP) -Denver Broncos linebacker Warrick Holdman was carted off the field and taken by ambulance to a hospital Thursday after he appeared to injure his head or neck.
There was no immediate word on the extent of his injury, although he was moving his arms and legs.
Holdman appeared to hit the crown of his helmet on another player's helmet and crumpled to the grass midway through the morning workout. He was rolled over onto his back after a minute, but stayed down for eight minutes.
His teammates gathered around him as he was strapped to a headboard and carted off the field to a waiting ambulance.
Holdman is a ninth-year pro in his first season in Denver after spending the last two years in Washington. He was working with the starters at strong side linebacker Thursday. He's among a handful of players who are vying for the position in one of the most heated competitions at camp.

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