Friday’s deadly attacks on the City of Light inspired people from New York to London to Tehran to add their own lights – from small candles to illuminated structures – in a worldwide show of solidarity with Paris and the people of France.

In Britain, Tower Bridge was lit in the colors of the French flag, a candlelight vigil was held in Trafalgar Square and the Tricolor flew at half-staff at Downing Street.

On BBC's Andrew Marr program – a TV public affairs show that runs nationally on Sunday morning – Marr introduced French bass Nicolas Courjal. The singer, who is appearing in "Carmen" at the Royal Opera House, offered a "musical tribute to the people of Paris" by singing a stirring a capella version of La Marseillaise, the French national anthem.  French Ambassador Sylvie Bermann, who was on the show discussing security cooperation, barely held back her tears.

"the road of violence and hatred does not resolve humanity's problems. And using the name of God to justify this road is blasphemy"

- Pope Francis

Around 100 Iranians held a candlelight vigil in front of the French Embassy in Tehran, according to the Shargh daily, a reformist newspaper. Some of those gathered had reportedly posted hand-written messages of condolence on nearby walls.

The Empire State Building in New York went dark in sympathy for the people of Paris, with Saturday night being the second consecutive night the 102-story landmark was not lit up.

The 408-foot spire atop One World Trade Center, however, was lit again Saturday night in the colors of the French flag. New York Gov. Andrew Cuomo said the spire would remain lit blue, white and red on Sunday. New York City's Mayor Bill de Blasio said an arch in Manhattan's Washington Square Park was also illuminated with the French colors on Saturday.

Pope Francis condemned the Paris terror attacks, calling it "blasphemy" to use the name of God to justify "violence and hatred."

The pope expressed shock at the “barbarity" of the attacks and told followers in St. Peter's Square on Sunday that “we wonder how can it come to the heart of man to conceive and carry out of such horrible events."

The pope added that "the road of violence and hatred does not resolve humanity's problems. And using the name of God to justify this road is blasphemy."

Francis expressed his deepest condolences to French President Francois Hollande and to the French people.

Special church services were planned at Notre Dame Cathedral in Paris and around France. Notre Dame, like other famous Paris sites, was closed to tourists Sunday but would be open to church-goers coming for services during the day. A special Mass by Paris Cardinal Andre Vingt-Trois was scheduled for Sunday night for families of victims and survivors, and the church was set to ring its renowned bells in a special homage.

“Our country knows the pain of mourning and must face barbarity propagated by fanatical groups,” the cardinal said in a message to parishioners.

An emotional Madonna asked the crowd at her concert Saturday in Sweden to observe a moment of silence for the victims of the Paris attacks.

Her eyes welling up and voice cracking, Madonna said she was considering cancelling Saturday night's show "because in many ways I feel torn. Why am I up here dancing and having fun when people are crying over the loss of their loved ones?"

But then, she said, she thought canceling the show would let the terrorists win: "Why should I allow them to stop me and to stop us from enjoying freedom?"

"Only love will change the world," Madonna said, before asking the crowd in Tele 2 Arena to fall silent and say a prayer for the victims. She resumed the concert with her 1989 hit single "Like a Prayer."