Tens of thousands of people are set to rally in Paris against rising fuel costs and President Emmanuel Macron's economic policies.

As many as 30,000 people are expected to protest in Paris alone on Saturday, said Denis Jacob, secretary general of police union Alternative Police. Authorities are worried that far-left and far-right extremists may infiltrate the demonstrations.

For more than a week, protesters clad in the fluorescent yellow jackets that all motorists in France must have in their cars have blocked highways across the country with burning barricades and convoys of slow-moving trucks, obstructing access to fuel depots, shopping centres and some factories.

They are opposed to taxes Macron introduced last year on diesel and petrol to encourage people to shift to more environmentally friendly transport.

Alongside the tax, the government has offered incentives to buy green or electric vehicles.

The unrest has left two dead and 606 injured in across France, the Interior Ministry said on Thursday.

A French minister said that protesters had given out the addresses of members of parliament and called for their homes to be vandalised.

"You have deputies who have been threatened by angry citizens," Parliamentary Affairs Minister Marc Fesneau told broadcaster Public Senat.

Meanwhile, a "yellow jacket" protester carrying an explosive grenade and demanding to see President Emmanuel Macron turned himself in late Friday, the news agency AFP reported, citing regional prefect Bernard Gonzalez.

The man surrendered to police in the car park of a shopping centre in Angers in western France after several hours of negotiations.

Paris police chief Michel Delpeuch warned protesters not to try to assemble on the city's Place de la Concorde, as suggested in several calls on social media, or other areas near the Elysee Palace.

Authorities have said that protesters can rally at the gardens around the Eiffel Tower, a slightly less central location.

But the decision has not been welcomed in the largely leaderless movement. "We aren't going for a giant picnic on a patch of grass," one activist told broadcaster BFMTV.

The government says it will not give in to protesters' demands to cancel planned rises in petrol and diesel taxes.

It has promised to aid poorer motorists and those who need to regularly travel long distances, but those measures do not appear to have placated the protesters.

With Reuters