Tens of thousands of Spanish lorry drivers have begun an indefinite strike over the soaring price of diesel, which has risen by 20% this year.

After stopping work at midnight, many disrupted traffic at one of the border crossings between Spain and France.

A number of lorries crossing the picket lines had their windscreens broken, lights ripped out and tyres slashed.

The government is preparing a package to assist the sector, with emergency loans and more flexible contracts.

It would also offer cash payments to older lorry drivers who are willing to retire.

French fishermen from Mediterranean ports have, meanwhile, joined fleets from other French ports in suspending their action pending an EU summit in Brussels later this month. Overnight, about 200 lorry drivers parked their vehicles beside roadside toll booths in the Catalonian town of La Jonquera, close to the border with France.

The protesters prevented other lorries from passing, and caused delays to car traffic.

Hundreds of lorry drivers also staged "snail protests" on the ring roads around the capital, Madrid, and Barcelona. There have also been protests in the Basque country and Valencia.

Most of the 90,000 hauliers participating in the strike are self-employed, or working for small and medium-sized haulage companies, and they have warned that many supermarkets will run out of goods within days. Petrol supplies may also be disrupted.

"We are the ones who move the goods that this country needs to keep working," the head of the transport association federation Fenadismer, Julio Villascusa, told Cadena SER radio.

"If we stop because we haven't got the money to buy fuel then the country will stop."