Flags will be flown at half mast on civic buildings in Brighton and Hove, after the terror attack in London on Saturday (June 3).
There will also be a one minute silence from 11am tomorrow (Tuesday), to remember the victims of the atrocity.
The leaders of the three main parties on Brighton and Hove City Council released a joint statement yesterday (June 4).
Cllr Warren Morgan (Labour), Cllr Tony Janio (Conservative) and Cllr Phélim Mac Cafferty (Green), said: "It’s with great sadness that today we have found ourselves repeating words like ‘shocked’, ‘appalled’ and ‘bewildered’ in conversations with our friends, families and neighbours about the terror attack in London last night.
“Whilst it's hard to find new and apt words to describe our condemnation of senseless attacks on everyday life, we repeat louder than ever and over and over again, that we stand together strong - united in compassion with people from all faiths and backgrounds. Division and hatred drives people into the ranks of those trying to recruit support to their terror campaigns. We will not let this happen.
“We send our deepest sympathy to all affected by these dreadful attacks and we thank the emergency services who once again have shown incredible bravery and skill in responding to horrific assaults on innocent people on busy streets and in packed bars and restaurants.
“We will join the nation in paying our respects when we observe a minute's silence on Tuesday at 11am in remembrance of those who lost their lives and all others affected by the attacks. Flags on council buildings in the city will fly at half-mast from tomorrow (Monday) morning.
“We will also be writing to the leader and chief executive of Southwark Council and the Mayor of London Sadiq Khan offering our support and condolences.”
Sussex Police and Brighton and Hove City Council also urged residents and communities to remain aware and to report any suspicious behaviour or activity immediately by calling the confidential anti-terrorist hotline on 0800 789 321 or 999 in an emergency.
Any any racist, religiously motivated or other hate incidents, should be reported to safeinthecity.info/getting-help/racist-incidents