It had been heaved over a balcony eight floors up and shattered on the ground. “Have you ever seen a television exploding on the pavement?” asked Bigot wearily as he stood under a light drizzle. “Well, it gave me quite a shock.”

As he spoke, thick clouds of smoke billowed from a textile warehouse set ablaze the previous night by another gang of youths, mainly of north African and black African origin, in this shabby suburb north of the capital. Firefighters who had tried to put it out during the night were pelted with stones.

“We’re used to stones,” grinned Bigot as blaring sirens echoed off the walls of giant concrete tower blocks built in the 1960s and 1970s to house the first immigrants. “Household appliances are a bit more dangerous. A falling television or a toaster, it could kill you.”

Bigot, 30, was on the front line in an increasingly desperate battle yesterday as the worst street violence seen in France for more than a decade spread from the Paris suburbs to other cities, with 250 people arrested and 900 vehicles torched on Friday night. This was the highest nightly total in a spate of rioting that followed the death 10 days ago of two youths apparently fleeing from the police.

Trouble was reported in Strasbourg, in eastern France, Rennes, Rouen and Lille in the northwest and Nice, Toulouse and Avignon in the south. In the Paris region, two nurseries, one in Yvelines and another in Bretigny-sur-Orge, were set on fire on Friday night along with a school in Seine-et-Marne.

In Meaux, a town east of the capital, youths threw Molotov cocktails at paramedics, whose patient was taken to hospital under police escort.

Last night the rioters returned, setting more than 600 cars on fire across France, and burning down a nursery school in Grigny, south of Paris. Rampaging youths also torched cars in central Paris for the first time since the disturbances began.

In the Normandy town of Evreux, arsonists laid waste to at least 50 vehicles, a shopping centre, a post office and two schools.

The Foreign Office urged British holidaymakers to be “extremely vigilant” in riot-hit areas. America warned its tourists to keep away from troublespots.

After an emergency cabinet meeting yesterday, Nicolas Sarkozy, the tough-talking interior minister, warned rioters that their actions could “cost dear in terms of sentences”. But he also promised to tackle the causes of violence, conceding that there were “a certain number of injustices in some neighbourhoods”.

France’s media and its politicians have portrayed the rioting as a form of protest against poverty, racial discrimination and the desperation felt by immigrant families who live in the cités — the grim housing estates erected a generation ago, often near big factories, to accommodate a booming immigrant population.

Attacks against firefighters or ambulance crews trying to save immigrant families from the flames suggested something more perverse than despair, however, and the divided government seemed at a loss over how to deal with the problem.

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