Dan Graziano of NFL FanHouse reports the reason why the Baltimore Ravens were forced to cancel the final week of their "Organized Team Activity" sessions.

According to Graziano, the Ravens were "conducting 'offense-defense' drills in which linemen block each other in conditions that simulate game action".

Such drills violate the rules under the Collective Bargaining Agreement concerning "the intensity and tempo of drills conducted on the Club's organized team activity days and the length of time spent by players at the Club's facility on such days", as the NFL Management Council and NFLPA announced in a statement earlier today.

The drills drew complaints from the player's to the union, who presented the case to the NFL, resulting in the cancellation of next week's practices.

Ravens general manager Ozzie Newsome and head coach John Harbaugh have owned up to the violations.