A small French research submarine arrived in Spain on Sunday. It will be used as soon as the weather permits to investigate whether fuel is still leaking from the sunken ship.

Local residents held a demonstration in the regional capital Santiago di Compostela on Sunday, as anger grew over the management of the crisis.

Trade unions and opposition parties supported the march, calling for Galicia to be declared a disaster area.

The protesters accused the authorities of not responding to the oil spill in an effective manner, and they called for the resignations of those accountable.