The Latest: Officials expect dozens dead in Nice

Police officers and a soldier stand by the sealed off area of an attack after a truck drove on to the sidewalk and plowed through a crowd of revelers who'd gathered to watch the fireworks in the French resort city of Nice, southern France, Friday, July 15, 2016. A spokesman for France's Interior Ministry says there are likely to be "several dozen dead" after a truck drove into a crowd of revelers celebrating Bastille Day in the French city of Nice. (AP Photo/Ciaran Fahey) (The Associated Press)

In this video grab taken Thursday July 14, 2016, a policeman chase people out of the cordoned-off area after a truck drove on to the sidewalk and plowed through a crowd of revelers who’d gathered to watch the fireworks in the French resort city of Nice. Officials and eyewitnesses described as a deliberate attack. There appeared to be many casualties. (BFMTV via AP) (The Associated Press)

French soldiers stand guard by the sealed off area of an attack after a truck drove on to the sidewalk and plowed through a crowd of revelers who'd gathered to watch the fireworks in the French resort city of Nice, southern France, Friday, July 15, 2016. A spokesman for France's Interior Ministry says there are likely to be "several dozen dead" after a truck drove into a crowd of revelers celebrating Bastille Day in the French city of Nice. (AP Photo/Ciaran Fahey) (The Associated Press)