Neighbours are being urged to report domestic violence rather than keep quiet in a new police advertisement.
The Metropolitan Police's message, "You make the call, we'll make it stop", reminds people about the consequences of their choice to ignore abuse.
The advert "listens in" to a fight from a neighbour's lounge.
The messages will be broadcast on radio and TV during England's World Cup matches, as research shows a link between drinking and a rise in abuse.
The police said nearly one in five murders in London stemmed from domestic violence.
The five-week campaign will also challenge the reasons members of the public and neighbours give for not intervening by calling 999.
The force chose to highlight the message now as a Home Office research carried out during the last World Cup showed there was a link between the high levels of alcohol consumption and emotional nature of the games and an increase in the prevalence of domestic violence incidents.
Commander David Zinzan said: "We can still investigate domestic violence crimes even if the victim does not want to tell police.
"This new and powerful ad campaign acts as a reminder that we can all play a vital part in helping to deter domestic violence perpetrators, and help more victims, by reporting domestic violence at the first moment possible if we witness it."
The force's specialist domestic violence investigators in each borough will visit their top ten domestic violence perpetrators and high-risk offenders with teams on alert during match days.