The league confirmed the penalties on Tuesday. ESPN.com first reported the violation and that Seattle would be fined $300,000 for the infractions.
Seattle will be docked the first two days of its 2015 mandatory minicamp and will be permitted one 2 1/2-hour practice on the final day. Seattle's players will be paid for all three days of the camp. The minicamp this past June was highlighted by a fight between All-Pro cornerback Richard Sherman and wide receiver Phil Bates that was caught by television cameras.
Seattle also lost a pair of organized team activities during the 2012 offseason due to excessive contact.