An airstrike has killed a leading Daesh (Islamic State) fighter in Syria, the Pentagon said Thursday.



Tunisian militant Tarik bin Tahar al-Awni al-Harzi was killed in Syria near the border with Iraq on June 16.



The United States had put up a reward of up to 3 million dollars for information on him.



His death would make it harder for Daesh to move weapons and fighters in and out of Iraq and Syria, Pentagon spokesman Jeff Davis said in a statement.



Al-Harzi had supplied militants with weapons bought in Libya and with explosive devices for car bombs and suicide attacks.



He also helped fighters from Europe to get to Syria via Turkey.



The previous day the US had killed al-Harzi's brother Ali in Mosul in Iraq.



Ali was suspected of involvement in the attack on the US consulate in Benghazi in September 2012. Four US diplomats were killed in the attack including the ambassador.