Britain warns citizens after truck attack kills 73 in Nice

French soldiers and police secure the area after a truck ran into a crowd celebrating the Bastille Day national holiday in Nice, France. REUTERS/Eric Gaillard

LONDON (Reuters) - Britain's Foreign Office issued an alert warning British citizens in the Nice area in France to follow the instructions of the French authorities after a Bastille Day attack killed 73 in the Riviera city.

An attacker drove a truck at high speed into a crowd watching fireworks late on Thursday, local media quoted officials as saying.