Faith groups from across Hounslow united to sign a pledge of solidarity against hatred and intolerance.
The event at Hounslow Mosque, in Wellington Road South, ended with attendees signing a poster bearing the message: "We stand together to counter hate and intolerance for a stronger and safer Hounslow."
Officers from Hounslow Police and the Met's Counter Terrorism Command provided safety and security advice on the day about issues ranging from graffiti to terror attacks.
The various groups present also discussed some of the issues facing them and how they could work together to support one another.
The 'We Stand Together' event was jointly organised by Hounslow Police and Hounslow Friends of Faith, which works to bolster relations between the borough's many religious groups.
Sergeant Mark Ogunwe said: "Today's event demonstrates that the people of Hounslow, who are from different races and religions, are united as a community.
"There will be those that will try to use our differences to drive us apart. However, it is our differences and diversity that we should celebrate and cherish - we stand together united against hatred and intolerance.
"I urge anyone who is a victim of hate crime to report the incident to the police so we can investigate it and catch those responsible."
Bessie White, secretary of Hounslow Friends of Faith, said: "The more we all stand up against hate crime and vilification of any group, the less it will happen and the more confident communities will feel."