In this image provided by the U.S. Air Force, a U.S. Army carry team transfers the remains of Army Staff Sgt. Dustin Wright of Lyons, Ga., late Thursday, Oct. 5, 2017, upon arrival at Dover Air Force Base, Del. Wright, 29, of Lyons, Ga., was one of four U.S. troops and four Niger forces killed in an ambush by dozens of Islamic extremists on a joint patrol of American and Niger Force. (Staff Sgt. Aaron J. Jenne/U.S. Air Force via AP)

In this image provided by the U.S. Air Force, a U.S. Army carry team transfers the remains of Army Staff Sgt. Dustin Wright of Lyons, Ga., late Thursday, Oct. 5, 2017, upon arrival at Dover Air Force Base, Del. Wright, 29, of Lyons, Ga., was one of four U.S. troops and four Niger forces killed in an ambush by dozens of Islamic extremists on a joint patrol of American and Niger Force. (Staff Sgt. Aaron J. Jenne/U.S. Air Force via AP)

WASHINGTON (AP) — After an extensive search, a U.S. soldier who had been missing for nearly two days in Niger was found dead, a result of a deadly ambush by dozens of Islamic extremists on a joint patrol of American and Niger forces, U.S. military officials said Friday.

The soldier, whose name has not been released, was one of four U.S. troops and four Niger forces killed in the attack.

His body was found by Niger soldiers on Friday near where the ambush occurred, and then transferred into U.S. custody at a safer location further from the attack site, said Army Col. Mark Cheadle, spokesman for U.S. Africa Command. The soldier’s body was then moved onto an American helicopter by U.S. forces in a somber ceremony and then taken away for formal identification.

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Eight Niger soldiers and two U.S. troops were wounded in the attack, but they were evacuated from the area on Wednesday after the attack unfolded. Cheadle said there was no indication the missing soldier was ever taken captive by the enemy forces.

U.S. officials described a chaotic assault in a densely wooded area, as 40-50 extremists in vehicles and on motorcycles fired rocket-propelled grenades and heavy machine guns at the patrol, setting off explosions and shattering windows. The soldiers got out of their trucks, returning fire and calling in support from French helicopters and fighter jets that quickly responded to the scene, according to officials. It’s unclear if the French aircraft were armed or if they fired on the insurgents.

The officials weren’t authorized to discuss the matter publicly so spoke on condition of anonymity.

U.S. officials say they believe extremists linked to the Islamic State group were responsible for the attack about 200 kilometers (120 miles) north of Niger’s capital, Niamey.

The U.S. and Niger forces were leaving a meeting with tribal leaders when they were ambushed.

Cheadle said there were no armed aircraft overhead as the U.S. and Niger forces went on their mission, but there was surveillance. The meeting with local leaders, he said, had been considered a low threat mission that wasn’t likely to lead to an encounter with any enemy forces.

He said there were about a dozen U.S. forces accompanying a company of Niger troops, for a total of about 40 service members in the joint mission.

Most of the U.S. troops were Army special forces, but the soldier found Friday was not a Green Beret, other U.S. officials said.

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In the frenetic aftermath of the attack, a wide array of forces from the U.S., Niger and France were tapped to search for the missing soldiers. Cheadle said more than 100 troops either took part in the search or were prepared to join it. It’s not clear if the U.S. sent ground forces in to search, but Niger troops were actively looking for the soldier.

U.S. forces killed in the attack were: Staff Sgt. Bryan C. Black, 35, of Puyallup, Washington; Staff Sgt. Jeremiah W. Johnson, 39, of Springboro, Ohio; and Staff Sgt. Dustin M. Wright, 29, of Lyons, Georgia. All three were members of the 3rd Special Forces Group, based at Fort Bragg, North Carolina.

Wright’s father, Arnold, said his son grew up playing sports with his three brothers and liked to joke around. He followed both his parents and one of his brothers into the Army. And his brother, Will, who also served in the military, described his younger brother as “an amazing special forces soldier and an amazing friend.” Will Wright said the two were just 13 months apart, were very close and shared a special bond over their military service.

Cheadle told Pentagon reporters that U.S. Africa Command is still gathering information about the attack, but no formal investigation has been launched. And he added the U.S. military is absolutely “resolved to go after those who attacked” the troops.

According to a statement by Niger’s army chief of staff, the joint patrol was attacked by “terrorist elements” in a dozen vehicles and about 20 motorcycles.

The statement said the deaths and injuries came “after intense fighting, during which elements of the joint force showed exemplary courage.”

U.S. special operations forces have been routinely working with Niger’s forces, helping them to improve their abilities to fight extremists in the region. That effort has increased in recent years, the Pentagon said.

Mali, Mauritania, Niger, Burkina Faso and Chad are putting together a 5,000-strong G5 Sahel force to fight the growing threat from extremists in the vast Sahel region. The first units are expected to deploy in October and all battalions should be on the ground by March 2018.

The Security Council unanimously adopted a resolution in June welcoming the deployment, but at U.S. insistence it did not include any possibility of U.N. financing for the force.

That force will operate in the region along with a 12,000-strong U.N. peacekeeping mission in Mali, which has become the deadliest in the world for U.N. peacekeepers, and France’s 5,000-strong Barkhane military operation, its largest overseas mission.