The president of the region that includes Nice says a truck that slammed into revelers celebrating Bastille Day on the city's waterfront was loaded with arms and grenades, and that the driver of the truck has now been killed by police.
Christian Estrosi told BFM TV that "the driver fired on the crowd, according to the police who killed him."
Estrosi said the truck was driven by someone who appeared to have "completely premeditated behavior." He added that "the truck was loaded with arms, loaded with grenades."
75 people have died in the attack. Another 50 people were wounded.
Eric Ciotti said on France Info radio that "It's a scene of horror." He said he was speaking from the scene.
The Nice prosecutor Jean-Michel Prette said bodies are strewn about along the roadway.
Local police told BFM television that gunshots were also heard.
Video posted on social media showed chaos as people ran from the crash scene.
The location of the truck driver was unknown.
U.S. intelligence officials told CBS News Justice and Homeland Security correspondent Jeff Pegues that they were still gathering information on the incident.
U.S. President Obama has condemned what he says "appears to be a horrific terrorist attack."
Obama says, "Our thoughts and prayers are with the families and other loved-ones of those killed."
Noting that the attack occurred on Bastille Day, Obama praised "the extraordinary resilience and democratic values that have made France an inspiration to the entire world."
Obama is offering French officials "any assistance that they may need to investigate this attack and bring those responsible to justice."
France's ambassador to the United States, Gerard Araud, characterized the events in Nice as a "terrorist attack."
"Our democracies - France, the United States, our other partners, we are besieged, we face a terrible threat," Araud said at a Bastille Day reception at the French Embassy in Washington late Thursday.
Presumptive Republican presidential nominee Donald Trump tweeted late Thursday that due to the attack, he will now postpone Friday's announcement dealing with his vice presidential pick.
(The Associated Press and CBS News contributed to this report.)
In light of the horrible attack in Nice, France, I have postponed tomorrow's news conference concerning my Vice Presidential announcement.
— Donald J. Trump (@realDonaldTrump) July 14, 2016
