Up to 60 people, suspected to be migrants, are missing after the wooden fishing boat they were travelling in sunk during a storm off the coast of Guinea-Bissau, the authorities there say.

The navy was unable to help when the boat went down on Monday as it lacked the resources, national ports head Felix Siga told the BBC.

The coastguard has two speedboats, but they are often unable to leave the port because of a lack of fuel, AFP news agency reports, quoting a naval officer.

The boat, which had a capacity of about 60 people, has been recovered, but none of the passengers have been found, the authorities say.

Guinea-Bissau has sometimes been used as a departure port for migrants trying to reach Europe, reports the BBC's Khady Lo.