British man Abu Layth al-Khurasani was killed in the past few days fighting for Islamist forces in Syria.
His friends paid tribute to his "martyrdom" on Twitter and Instagram.
He sent his last tweet on January 30th, writing: "Turkey are now actively aiding FSA on the borders of Al Ra'i, there are two Turkish tanks guarding a checkpoint close to the town."
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State Department spokeswoman Heather Nauert said Pence "was ready to take this opportunity."