Paris Attacks San Francisco City Hall
San Francisco City Hall was lit up with blue, white and red lights, the colors of the French flag, following the Paris terror attacksStephen Lam/Reuters

The Eiffel Tower stood dark in the City of Lights in mourning after a series of coordinated deadly terror attacks shook the city last night, which killed at least 120 people. French President François Hollande declared a state of emergency, and closed the country's borders and imposed a curfew.

As world leaders condemned the shootings and suicide bomb attacks, landmarks across the world were illuminated in the colours of France's tricolour flag to symbolise their solidarity with France.

Tower Bridge will also don the colours of the French flag this evening, for the Lord Mayor's show. The usual annual fireworks display to celebrate 800 years of the world's oldest street party have been canceled by its administration.

Wembley Stadium in London. Christ the Redeemer statue in Rio de Janeiro, and the CN Tower in Toronto, Canada were lit up in red, white and blue on Friday evening.

In Australia, the sails of the Sydney Opera House have also been illuminated in red, white and blue in a show of solidarity.

"Our hearts break with yours, Paris. But our spirits will never be broken. Neither will our determination to stand together against these cowardly, evil acts of terror. New South Wales premier Mike Baird said in a statement on Facebook."We mourn with you, and we stand with you, Paris."

While AirBnb cancelled events in Paris, Paris residents have also offered to open their homes to stranded visitors posting on Twitter with hashtag on Twitter #PortOuverte, which translates to #OpenDoor.

Prime Minister David Cameron says he is ''shocked" by the Paris attacks and violence. ''Our thoughts and prayers are with the French people. We will do whatever we can to help," he tweeted.

US President Barack Obama called the attacks an ''outrageous attempt to terrorise innocent civilians" and vowed to do whatever it takes to help bring the perpetrators to justice. He called the attacks a ''heartbreaking situation" and an ''attack on all of humanity".