Article here. Excerpt:

'Do brutal attacks on women by their husbands or boyfriends surge during the World Cup? According to a May 25 press release by England’s Association of Chief Police Officers (ACPO), “cases of domestic abuse increase by nearly 30% on England match days.” The shocking 30 percent figure was from a study prepared and publicized by the British Home Office. Determined to stem the assaults, officials flooded pubs and the airwaves with graphic warnings. “Don’t let the World Cup leave its mark on you,” warned a poster distributed by the West Yorkshire Police. It showed the bare back of a cowering woman marked by bruises, cuts, and the imprint of a man’s shoe. News stories with titles such as “Women’s World Cup Abuse Nightmare” informed women that the games could uncover, “for the first time, a darker side to their partner.”
...
In that roiling sea of media credulity, Ken Ringle, a reporter at the Washington Post, did something no other reporter thought to do: He checked the facts. He quickly discovered that there was no evidence linking football and domestic violence. The source for the 40 percent factoid was a mistaken remark by an activist at a press conference in Pasadena, Calif. Today, what has come to be known as the Super Bull Sunday hoax, is a staple in discussions of urban legends. Could the World Cup Abuse Nightmare be a copycat fraud?

“A stunt based on misleading figures,” is the verdict of BBC legal commentator Joshua Rozenberg and producer Wesley Stephenson. They recently investigated the alleged link between the televised World Cup games and violence in the home for their weekly program Law in Action. On June 22 — day twelve of the 2010 World Cup — they aired the story. It included an interview with a prominent Cambridge University statistician, Sheila Bird, whom they had asked to review the Home Office study and its finding of a 30 percent increase in domestic abuse. She found it to be so amateurish and riddled with flaws that it could not be taken seriously. ...'