Spain said Friday it would not free two captured pirates as demanded by fellow brigands who are holding a Spanish trawler and 33 crew members off the coast of Somalia.

Three crewmen that had been removed from the vessel and taken to the Somali mainland by hijackers to add pressure on Spain to repatriate the arrested pirates were returned to the ship late Friday, Foreign Minister Miguel Angel Moratinos said.

Moratinos said First Officer Patxi Valdes, ship's electrician Antonio Manuel Perez and crewman Joaquin Fernandez had been returned to their fishing boat safely.

"Somali authorities have offered all their support to the Spanish government," Moratinos said.

The trawler's captain told Spanish media Thursday that the pirates on board had threatened to start killing the hostages.

Deputy Defense Minister Constantino Mendez said Friday the two Somali men were captured in connection with the hijacking of the Spanish-registered tuna boat Alakrana on Oct. 2 in the Indian Ocean and brought to Madrid.

He told Spanish National Radio: "The situation is not negotiable."

However, he seemed to leave open a possibility of transferring them to the court system of another country.

Pirates holding the Alakrana took three crew members ashore to Somalia on Thursday, the Defense Ministry said.

The wives of two crew members who spoke to their husbands Thursday said the pirates are demanding the release of the two in custody in Madrid as a condition for letting the ship and its crew go.

On Thursday night, the skipper of the Alakrana, Ricardo Blach, told Spanish television the heavily armed pirates on board had threatened to kill the three crew members taken ashore if there was no progress in freeing the two men.

"They told us an hour ago that if there is no movement relating to those who are in Spain, then they would begin by killing those three in three days' time, and then they would take another three, and so on," Blach said.

Blach said around 30 pirates aboard the Alakrana consumed drugs, often quarreled among themselves and were equipped with machine guns, bazookas, grenade launchers and handguns. "If you say anything to them, they put a pistol to your forehead," he said. Continued...