As commander André Morais, of the Maritime Police of Olhão, Faro district, told the Lusa agency, the wooden vessel was detected at about 4.30am and on board were 11 men, aged between 21 and 30, "probably from North Africa".

"They were taken to the command of the Maritime Police of Olhão for an attempt at identification and will be handed over to the Foreigners and Borders Service," he explained.

The commander of the port of Olhão explained that the three men were taken to the Hospital de Faro "to detect possible health problems", as they had abdominal pain.

One of the men had a trauma to his leg, which may have resulted from a fall during the trip, the source said.