Story highlights Pentagon: Sanafi al-Nasr, a Saudi citizen, killed in air strike by U.S.-led coalition in Syria

Nasr was the head of the Khorasan Group, said to be plotting attacks against the West

He is the fifth senior Khorasan Group leader killed in the last four months

(CNN) The leader of an al Qaeda-linked group allegedly bent on attacking the West has been killed in an airstrike by the U.S.-led coalition in Syria, U.S. officials said Sunday.

He was killed in an airstrike in northwest Syria on Thursday, the statement said.

Nasr, who was once al Qaeda's chief financial officer and had been designated a Specially Designated Global Terrorist by the U.S. Treasury, is the fifth senior Khorasan Group leader killed in the last four months, said the statement.

An image from Twitter of Sanafi al-Nasr, a top Khorasan Group leader killed in a strike in Syria.

"The United States will not relent in its mission to degrade, disrupt and destroy al-Qaeda and its remnants," said Secretary of Defense Ash Carter.

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