QAMISHLI, Syria (Reuters) — A rare U.S. helicopter raid on a government-held village in Syria’s northeast on Thursday killed an Islamic State official hiding out there, two security sources said.

The United States has carried out previous raids in Syria against members of IS, but Thursday’s would be the first known operation in a zone held by forces loyal to President Bashar al-Assad.

Early on Thursday, U.S. special forces carried out a rare operation on the government-held village of Muluk Saray in the northeastern province of Hasakeh, Syrian state television said in its Telegram channel.

It said one person was killed and others were captured. It gave no further details on their identities.

Two security sources later told Reuters that the man who was killed was an Islamic State group official wanted by the United States.

“The airborne operation targeted a key IS leader present in the areas controlled by the Syrian government. It was successful,” one of the security sources said.

The source said the man who was killed was responsible for coordinating across IS sleeper cells in the area.

“This operation aims to expand the scope of targeting this organization’s members across different parts of Syria,” the source added.

The second source confirmed the man killed was an IS official and said the U.S. forces had taken his body with them as they retreated.

A local source said the man had moved to the village of Muluk Saray in recent years from Taif, a town near the border with Iraq that was once an IS stronghold.

“People thought he was a shepherd — no one knows his true identity,” said the source.

The local source said U.S. forces also raided a building used by Syrian security and detained “several people” there.

Other residents of the area confirmed the raid to Reuters.

One said that U.S. helicopters landed in the village after midnight and told residents by loudspeaker to stay indoors and keep their lights off. The resident said the operation lasted several hours and that there was no exchange of fire with the U.S. troops.

A spokesperson for the U.S.-led coalition formed to fight Islamic State did not immediately respond to a request for comment.

(Reporting by Suleiman Al-Khalidi in Amman, Lina Najem in Dubai and Orhan Qereman in Qamishli; writing by Maya Gebeily; editing by Samia Nakhoul, Toby Chopra, William Maclean)

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