Thousands of fans gathered in Pioneer Square to celebrate and a few took things too far. Police said two people were shot in unrelated incidents. The victims' wounds were not life-threatening and one arrest was made immediately after. The suspect in the other shooting remained at large, the Seattle Times reported.
Some damage was reported to businesses in the area, mostly due to broken panes of glass. Police estimated about $25,000 damage.
Celebratory rowdiness also broke out on Greek Row near the University of Washington campus. The impromptu festivities included the blasting of car horns, smashing of champagne bottles and the lighting of fireworks as crowds blocked intersections, the newspaper said.
Eventually college students turned to making large bonfires in the street, burning couches and other furniture, police said. One man was arrested for hazardous burning, KIRO-TV, Seattle reported. Police moved in and cleared out the area of about 3,000 young people, only to see them return later with more furniture to burn.
"We burned couches. Then they came and they left. We burned more couches. They came and then left," a student only identified as Chris told KIRO.
Despite some illegal revelry, the atmosphere in the city was jubilation for a largely championship-starved city, the Times said. People waved team flags, yelled and high-fived strangers in the wake of Sunday's 43-8 dismantling of the Denver Broncos at Met Life Stadium in New Jersey.
Hundreds of people had congregated outside CenturyLink Field, where the Seahawks play their home games, as Seattle police in riot gear watched.
"I've been waiting all my life for this," Jim Jorgensen of Normandy Park told the newspaper. "Now I'll die a happy man."
Another fan in the sea of blue Seahawks jerseys, Marcus Reed, said Seattle's win "was a hell of a game!"
"I'm on Cloud 9 right now," Reed said.
Jona Bergman, 32, of Seattle said the experience was unprecedented for him and he didn't "even know how to feel."
"I kind of feel the urge to flip over that car, but I'm too passive aggressive to do it," he said.
Spencer Harwood of Vancouver, British Columbia, said even though he and his friends are from neighboring Canada, "We're so proud and happy!"
2014: NFL Cheerleaders [PHOTOS]
LeBron James reveals his new Nike shoes