LA CAVERNE DU PONT-D'ARC, France -- Amid reinforced security a day after the deadly attack in Nice, the Tour de France rolled on and defending champion Chris Froome extended his overall lead on Friday.

Thousands of people lined the 37.5-kilometre (23-mile) time trial route to celebrate the Tour and pay homage to the dozens killed and injured by a truck which drove through beachfront crowds celebrating Bastille Day.

Froome finished second to Tom Dumoulin on the 13th stage, but ahead of all other general classification contenders.