Tour stage starts with minute's silence after Nice attacks

Cycling - Tour de France cycling race - The 37.5 km (23.3 miles) Stage 13 from Bourg-Saint-Andeol to La Caverne du Pont-d'Arc, France - 15/07/2016 - A man wear a black armband as country mourns. REUTERS/Jean-Paul Pelissier

BOURG-SAINT-ANDEOL, France (Reuters) - The Tour de France continued in a low-key but defiant mood under heightened security on Friday, with riders, spectators and race officials observing a minute's silence for the scores of victims of the Bastille Day attack in Nice.

A gunman at the wheel of a heavy truck ploughed into a crowd celebrating France's national day in the southern city late on Thursday, killing at least 84 people and injuring scores in what President Francois Hollande called a terrorist act.