In addition, the league also stripped the team of two double practices in 2015 for the violation, per ESPN's Chris Mortensen:
"The Seattle Seahawks and coach Pete Carroll have been collectively fined more than $300,000, according to sources, and will lose two double practices in 2015 as ruled by NFL commissioner Roger Goodell for violating no-contact rules that govern NFL teams' offseason practices.
"Carroll's fine was at least $100,000 and the Seahawks were docked over $200,000 while the team will lose at least two minicamp practices next season because it had excessive contact between players during a June 18 practice, per sources.
"The NFL confirmed the loss of two practices, but said the team will be allowed one practice session on the final day of its minicamp.
"The Seahawks had been fined an undisclosed amount in 2012 by Goodell for a similar violation under Carroll's supervision and lost their final two organized team activities practices, sources added.
"The 2011 collective barganing agreement bans physical contact between players during the offseason.
"A Seahawks spokesman declined immediate comment, as did a league spokesman."
According to The Seattle Times' Bob Condotta, the practice in question was allegedly the one where cornerback Richard Sherman and wide receiver Phil Bates figured in an altercation. The Seahawks tried to apppeal, but were denied:
"The NFL has confirmed that the Seahawks have been penalized for violating the league's policies regarding contact during mini-camp practices in June.
"The NFL has confirmed the Seahawks will also lose their two first mini-camp practices in 2015 while the Times has confirmed an earlier ESPN report that the Seahawks will be fined more than $300,000.
"It's believed the penalties stem from a practice that occurred on June 18 that included a fight between cornerback Richard Sherman and receiver Phil Bates.
"After a review of that practice, the NFL determined that the Seahawks had 'excessive levels of on-field contact.' The Seahawks appealed the ruling and were denied.
"The NFL's Collective Bargaining Agreement has strict guidelines on what is permissible during mini-camp practices.
"Specifically, the rule states: 'There will be no contact work (e.g. 'live' blocking, tackling, pass rushing, bump-and-run) or use of pads (helmets permitted) at minicamps.'
"ESPN reported that coach Pete Carroll was fined 'at least' $100,000 while the team was also fined an additional $200,000.
"The Seahawks had no official comment.
"The Seahawks were also fined in 2012 for violating the rules regarding contact during Organized Team Activities.
"UPDATE: The NFL has since officially confirmed the violation. Here is the NFL's statement:
"'The Seahawks will forfeit (their) first two days of on-field double practices during its 2015 mandatory minicamp for veteran players and will be permitted a single 2 1/2-hour on-field practice session on the final day of its minicamp. Seahawks players will be paid for the cancelled practice sesssions. The violation was for permitting the club's players to engage in excessive levels of on-field physical contact during the team's 2014 mandatory minicamp for veteran players.'"