Somali pirates holding an American on a drifting lifeboat vowed on Friday to fight any attack by U.S. naval forces and reportedly recaptured their hostage when he jumped overboard to escape.

Ship captain Richard Phillips leapt into the sea, but was quickly brought back, U.S. media said, citing defense sources.

We are not afraid of the Americans, one of the pirates told Reuters by satellite phone on behalf of the gang holding Phillips far off the Somali coast in the Indian Ocean.

We will defend ourselves if attacked.

Despite their defiant talk, maritime groups tracking the saga -- the first time Somali pirates have captured an American -- say a more likely outcome is a negotiated solution, possibly involving safe passage in exchange for their captive.

The gang is also seeking a ransom, friends say.

Four pirates have been holding Phillips, a former Boston taxi driver, since Wednesday after a foiled bid to hijack the 17,000-tonne Maersk Alabama several hundred miles off Somalia.

The ship's lifeboat has run out of fuel.

Two boats full of heavily-armed fellow pirates have taken to sea in solidarity with the four on the lifeboat, but are too nervous to come near due to the presence of foreign naval ships including the USS Bainbridge destroyer which is up close.

Other pirates want to come and help their friends, but that would be like sentencing themselves to death, said Andrew Mwangura, coordinator of the East African Seafarers' Assistance Program that monitors the region's seas.

They will release the captain, I think, maybe today or tomorrow, but in exchange for something. Maybe some payment or compensation, and definitely free passage back home.

Phillips is one of about 270 hostages being held at the moment by Somali pirates, who have been plying the busy sea-lanes of the Gulf of Aden and Indian Ocean for years.

They are keeping 18 captured vessels at or near lairs on the Somali coast -- five of them taken since the weekend alone.

Yet the fact Phillips is the first U.S. citizen seized, and the drama of his 20-man American crew stopping the Alabama being hijacked on Wednesday, has galvanized world attention.

It has also given President Barack Obama another foreign policy problem in a place most Americans would rather forget.

Perched on the Horn of Africa across from the Middle East, Somalia has suffered 18 years of civil conflict since warlords toppled former dictator Mohamed Siad Barre in 1991.

Americans remember with a shudder the disastrous U.S.-U.N. intervention there soon after, including the infamous Black Hawk Down battle in 1993 when 18 U.S. troops were killed in a 17-hour firefight that later inspired a book and a movie.

U.S. SENDS MORE SHIPS

In another Somali-American saga, Captain Phillips apparently volunteered to get in the lifeboat with the pirates on Wednesday to act as a hostage for the sake of the Alabama's 20 American crew members, who somehow retook control of their ship.

The freighter, which is carrying food aid for Uganda and Somalia, is now on its way to its original destination, Mombasa port in Kenya. It is expected to arrive by Sunday night.

Friends of the pirates on the lifeboat said the situation was becoming desperate.

The captain might be harmed and so might my friends, said a pirate on one of the two boats that left the Somali coast. We see more warships coming to the scene. We cannot go further.

The USS Bainbridge has called on the FBI and other U.S. officials to help negotiate with the pirates.

U.S. military officials said more forces were on the way and that all options were on the table to save the captain.

Last year saw an unprecedented number of hijackings off Somalia -- 42 in total. That disrupted shipping, delayed food aid to east Africa, increased insurance costs, and persuaded some firms to send cargoes round South Africa instead of through the Suez Canal, a critical route for oil.

It also brought a massive international response, with ships from the United States, Europe, China, Japan and others flocking to the region to protect the sea-routes.

As the patrols mainly focused on the Gulf of Aden, the gateway to the Suez, the pirates began moving further afield and have been striking as far south as Indian Ocean waters near the Seychelles and Madagascar.

Analysts say the attack on the Alabama could lead to a new phase in international efforts to stop piracy.

Piracy may be a centuries-old crime, but we are working to bring an appropriate, 21st-century response, U.S. Secretary of State Hillary Clinton said.

With a vast area for the pirates to roam in, however, analysts say the only real solution is peace and stable government in Somalia itself.

(Additional reporting by Washington bureau, Mogadishu office, Andrew Cawthorne in Nairobi; writing by Andrew Cawthorne; editing by Andrew Roche)

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