Coalition strike kills 18 allied fighters in Syria blunder — Pentagon

A U.S-led coalition airstrike against ISIS mistakenly killed 18 members of the Syrian Democratic Forces fighting President Bashar Assad, the Pentagon admitted Thursday.

It was not immediately clear if a U.S. plane was involved in the 'friendly fire' strike, which happened south of Tabqah in northern Syria on Tuesday.

"The strike was requested by the partnered forces, who had identified the target location as an ISIS fighting position," the Pentagon said in a statement.

See more on U.S. strikes in Syria:

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US airstrikes in Syria -- launches and impact
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US airstrikes in Syria -- launches and impact

U.S. Navy guided-missile destroyer USS Ross (DDG 71) fires a tomahawk land attack missile in Mediterranean Sea on April 7, 2017.

(Robert S. Price/Courtesy U.S. Navy/Handout via REUTERS)

Battle damage assessment image of Shayrat Airfield, Syria, is seen in this DigitalGlobe satellite image, released by the Pentagon following U.S. Tomahawk Land Attack Missile strikes from Arleigh Burke-class guided-missile destroyers, the USS Ross and USS Porter on April 7, 2017.

(DigitalGlobe/Courtesy U.S. Department of Defense/Handout via REUTERS)

U.S. Navy guided-missile destroyer USS Ross (DDG 71) fires a tomahawk land attack missile in Mediterranean Sea on April 7, 2017.

(Robert S. Price/Courtesy U.S. Navy/Handout via REUTERS)

Shayrat Airfield in Homs, Syria is seen in this DigitalGlobe satellite image released by the U.S. Defense Department on April 6, 2017 after announcing U.S. forces conducted a cruise missile strike against the Syrian Air Force airfield. DigitalGlobe/Courtesy U.S. Department of Defense/Handout via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. NO RESALES. NO ARCHIVE. MANDATORY CREDIT.

U.S. Navy guided-missile destroyer USS Ross (DDG 71) fires a tomahawk land attack missile in Mediterranean Sea on April 7, 2017.

(Robert S. Price/Courtesy U.S. Navy/Handout via REUTERS)

U.S. Navy guided-missile destroyer USS Ross (DDG 71) fires a tomahawk land attack missile in Mediterranean Sea on April 7, 2017.

(Robert S. Price/Courtesy U.S. Navy/Handout via REUTERS)

Shayrat Airfield in Homs, Syria is seen in this DigitalGlobe satellite image on February 18, 2017 and released by the U.S. Defense Department on April 6, 2017 after announcing U.S. forces conducted a cruise missile strike against the Syrian Air Force airfield. 

(DigitalGlobe/Courtesy U.S. Department of Defense/Handout via REUTERS)

U.S. Navy guided-missile destroyer USS Porter (DDG 78) conducts strike operations while in the Mediterranean Sea which U.S. Defense Department said was a part of cruise missile strike against Syria on April 7, 2017.

(Ford Williams/Courtesy U.S. Navy/Handout via REUTERS)

U.S. Navy guided-missile destroyer USS Porter (DDG 78) conducts strike operations while in the Mediterranean Sea, April 7, 2017. Porter, forward-deployed to Rota, Spain, is conducting naval operations in the U.S. 6th Fleet area of operations in support of U.S. national security interests in Europe.

(U.S. Navy photo by Mass Communication Specialist 3rd Class Ford Williams/Released)

Battle damage assessment image of Shayrat Airfield, Syria, is seen in this DigitalGlobe satellite image, released by the Pentagon following U.S. Tomahawk Land Attack Missile strikes from Arleigh Burke-class guided-missile destroyers, the USS Ross and USS Porter on April 7, 2017. 

(DigitalGlobe/Courtesy U.S. Department of Defense/Handout via REUTERS)

U.S. Navy guided-missile destroyer USS Porter (DDG 78) conducts strike operations while in the Mediterranean Sea which U.S. Defense Department said was a part of cruise missile strike against Syria on April 7, 2017.

(Ford Williams/Courtesy U.S. Navy/Handout via REUTER)

U.S. Navy guided-missile destroyer USS Porter (DDG 78) conducts strike operations while in the Mediterranean Sea which U.S. Defense Department said was a part of cruise missile strike against Syria on April 7, 2017.

(Ford Williams/Courtesy U.S. Navy/Handout via REUTERS)

Battle damage assessment image of Shayrat Airfield, Syria, is seen in this DigitalGlobe satellite image, released by the Pentagon following U.S. Tomahawk Land Attack Missile strikes from Arleigh Burke-class guided-missile destroyers, the USS Ross and USS Porter on April 7, 2017. 

(DigitalGlobe/Courtesy U.S. Department of Defense/Handout via REUTERS)

U.S. Navy guided-missile destroyer USS Porter (DDG 78) conducts strike operations while in the Mediterranean Sea which U.S. Defense Department said was a part of cruise missile strike against Syria on April 7, 2017.

(Ford Williams/Courtesy U.S. Navy/Handout via REUTERS)

Syrian shepherds tend their flock near the damaged Shayrat ('ash-Shairat') airfield at the Syrian government forces military base targeted earlier overnight by US Tomahawk cruise missiles, southeast of the central and third largest Syrian city of Homs, on April 7, 2017. / AFP PHOTO / STRINGER (Photo credit should read STRINGER/AFP/Getty Images)
A picture taken on April 7, 2017 shows a view of the damaged Shayrat ('ash-Shairat') airfield at the Syrian government forces military base targeted earlier overnight by US Tomahawk cruise missiles, southeast of the central and third largest Syrian city of Homs. / AFP PHOTO / STRINGER (Photo credit should read STRINGER/AFP/Getty Images)
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However, "the target location was actually a forward SDF fighting position," it said.

"The Coalition's deepest condolences go out to the members of the SDF and their families," it continued. "The Coalition is assessing the cause of the incident and will implement appropriate safeguards to prevent similar incidents in the future."

The SDF includes ethnic Assyrians, Turkmen, Armenians and Arabs but is dominated by Syria's main Kurdish fighting force, the People's Protection Units, or YPG.

Several nations have lent their air power to the coalition to defeat ISIS.

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