South Korean naval special forces approach the Samho Jewelry vessel using a boat before carrying out an operation to rescue its crew members, in the Arabian Sea Jan 21, 2011. [Photo/Agencies]

SEOUL - At dawn Friday, South Korean commandos steered their boat to a hijacked freighter in the Arabian Sea. Under covering fire from a destroyer and a Lynx helicopter, they scrambled up a ladder onto the ship, where Somali pirates were armed with assault rifles and anti-tank missiles.

Five hours after the risky rescue began, it was over.

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All 21 hostages were freed from the gunfire-scarred freighter. Eight pirates were killed and five were captured in what President Lee Myung-bak called a "perfect operation."

It was a remarkable ending to the daring and rare raid, handing South Korea a stunning success in the battle against pirates who have long tormented shipping in the waters off the Horn of Africa.

The lone casualty among the crew was the captain, identified as Seok Bae-gyun, 58, who was shot in the stomach by a pirate, South Korea's JoongAng Ilbo newspaper reported. He was taken by a US helicopter to a nearby country for treatment, but the wound was not life-threatening, Lt. Gen. Lee Sung-ho of the South Korean Joint Chiefs of Staff told reporters in Seoul.

"My heart stopped when the news of all the members being rescued was broadcast," the captain's son, Seok Hyun-wook, told the newspaper. "If I knew that they were planning a rescue, I would have been nervous all along."

The successful raid also was a triumph for South Korea's president and military. Both came under harsh criticism at home for being too slow and weak in the response to a North Korean attack in November on a South Korean island near disputed waters that killed two marines and two civilians.

Friday's operation came a week after the Somali attackers seized the Samho Jewelry, a 11,500-ton chemical carrier sailing from the United Arab Emirates to Sri Lanka.

"We will not tolerate any behavior that threatens the lives and safety of our people in the future," President Lee said in a brief televised statement.

The wife of one of the South Korean crew wept in gratitude as the hijacking ended. The unidentified woman told the Yonhap news agency that "family members couldn't sleep or eat well and prayed for a safe return. I am very relieved."

Choi Young-soo, the father of 25-year-old crewman Choi Jin-kyung, told the JoongAng Ilbo that his relatives "were in tears when we saw the news."

"When I heard the news of the hijack, I thought the sky was falling," the elder Choi was quoted as saying.

South Korean President Lee Myung-bak speaks at the presidential Blue House in Seoul Jan 21, 2011 after South Korean naval special forces rescued crew members of the Samho Jewelry vessel in the Arabian Sea. [Photo/Agencies]

Of the 21 crew members, eight were from South Korea, two were from Indonesia and 11 were from Myanmar. South Korea's Joint Chiefs of Staff said the Samho Jewelry was being accompanied by the destroyer to a safe area; it did not elaborate.

Other countries' special forces have launched several raids to rescue hijacked ships in recent months, but hours, not days, after capture, and then only after they were assured the crew was locked in a safe room, commonly referred to as a "citadel."

The raid on the Samho Jewelry was rare because it came a week after the ship was seized. It was not clear if the crew was in a citadel during the rescue, but the wounded captain clearly was not.

Security forces are usually reluctant to launch such raids because of the risk to the hostages.