A day after the attack in the French Riviera city of Nice claimed the lives of 84 people, local citizens and tourists went back to the Promenade des Anglais to pay tribute to the victims of the horrific incident by laying flowers. They also lighted candles at the makeshift memorial constructed along the promenade, the Guardian reported.

Hashtags like #PrayforNice, #JeSuisNice were trending on social media.

Security was tightened for the 13th stage of Tour de France which was held on Friday. Officials wore black ribbons on their arms as a sign of tribute to those who died in the attack. Paris' Eiffel Tower was also lit up with the colours of the French national flag, the Telegraph reported.

The French national flag was flown at half-mast over 10 Downing Street in London while people placed flowers at embassies across Europe.

King Felipe VI and Queen Letizia of Madrid observed a minute's silence towards the end of a royal audience with students.

A vigil was held at the National Assembly for Wales in the United Kingdom, while the French flag was flown at half mast at the Open golf championships in Scotland. A condolence book will be opened for people to pay tribute to the deceased at the Belfast City Hall on Monday.

Buildings in several cities worldwide like New York, Brisbane, Sydney, Dallas and Mexico were illuminated with the French tricolor on Friday to show solidarity with the country.

The national flag of France was flying at half mast above the Sydney Harbour Bridge in Australia on Saturday as citizens gathered to pay tributes to the victims of the horrific attack.

The French community in Bangkok and Tokyo attended vigils. Gilles Garachon, the French ambassador to Thailand attended the candlelight vigil in Bangkok while the members observed a minute's silence.

The vigil held at the residence of the French ambassador to Japan was also attended by the members of the French community in Tokyo, the daily reported.