"Out of solidarity with the French people and the City of Paris, we have decided to suspend our broadcast of 24 Hours of Reality and Live Earth," the former vice president said in a statement. "Our thoughts are with all who have been affected and the entire nation of France. We send our condolences to the families of those who have been killed or injured."

The Gore-led event, timed ahead of a major U.N. global warming summit that will begin Nov. 30 in Paris, had already featured a musical performance from Duran Duran. Additional segments were slated to continue through Friday night and into Saturday in eight other cities around the world, including Miami, Beijing and Delhi.

President Barack Obama and dozens of world leaders are slated to descend on Paris for the start of the high-stakes climate talks. It's unclear whether the attacks will delay the negotiations, which have already involved months of planning. But it's almost certain that security will be increased dramatically. Obama will is scheduled to be in Paris from Nov. 30-Dec. 1.