NEW YORK - Several Manhattan skyscrapers showed the colors of the French flag overnight in tribute to the people of France still reeling from the devastating Notre Dame cathedral fire.

The Empire State Building and the 400-foot spire of the World Trade Center were lit up in red, white and blue.

Governor Andrew Cuomo ordered the World Trade Center to show off the colors.

He called it a tribute to "one of the world's most sacred and celebrated religious monuments."

Meanwhile, more than a billion dollars has been raised to help rebuild the historic cathedral.

The French government is looking to finish the restoration within five year.

The United Nations has also pledged to help repair the iconic landmark after fire tore through the roof.

French companies Total and L'Oreal will donate more than $100 million each, as will billionaire tycoons Bernard Arnault and Francois Pinault.

Here in the U.S., the University of Notre Dame is contributing $100,000.

Hundreds came out for a prayer vigil in Paris Tuesday night.

They sang and marched through the streets holding candles before stopping in the plaza outside Notre Dame.

It's still not clear what caused the fire.

Crews are still asssessing the damage.

The cathedral's roof completely caved in and the iconic spire collapsed, but much of the stonework and stained glass remain intact.

Several works of art and relics inside were also saved.