The city hall building in Tel Aviv, Israel, lit up in red, white, and blue on Monday to show support for the United States after Sunday's mass shooting in Las Vegas.

'We grieve with you'

According to the Times of Israel, the facade of the building alternately displayed an American flag and an Israeli flag, going back and forth to represent the friendship between the two nations, the report said.

The Times added that the building is often used to show support for different causes or show solidarity following terror attacks in other countries.

Also on Monday, Israeli Prime Minister Benjamin Netanyahu said that Israel stands “shoulder to shoulder” with the United States in the wake of the attack.

"On this terrible day, the people of Israel stand shoulder to shoulder with the American people in mourning and sorrow," Netanyahu wrote. "Our hearts go out to the victims' families and we wish a speedy recovery to the wounded. We grieve with you."

Condolences

Other world leaders including British Prime Minister Theresa May, French President Emmanuel Macron, Canadian Prime Minister Justin Trudeau, Mexican President Enrique Peña Nieto, and Pope Francis expressed condolences as well.

Paris Mayor Anne Hidalgo said on Twitter that the Eiffel Tower would be dark on Monday evening in honor of the victims of the Las Vegas shooting, as well as a stabbing Sunday in Marseille that left two women dead.

The Vegas attack

At least 59 people were killed and more than 500 were injured when a gunman opened fire on about 22,000 concertgoers on Sunday at the Route 91 Harvest country music festival in Las Vegas, according to CNBC.

Police have identified the gunman as Stephen Paddock, 64. They said Paddock opened fire on the concert from his 32nd-floor room at the Mandalay Bay Resort and Casino. He was reportedly found dead when police entered his room.