(JTA) — Hassan Nasrallah, the top leader of the Lebanon-based terrorist group Hezbollah, blamed the killing of operative Samir Kuntar on Israel and said his group would retaliate.

“We reserve the right to respond to this assassination at the time and place of our choosing,” Nasrallah said Monday evening in a televised speech from Beirut, the Times of Israel reported. The newspaper cited an English translation from a journalist with the al-Mayadeen Arabic satellite television channel.

Nasrallah’s statement came hours after a Syrian rebel group claimed responsibility for the airstrike in Damascus that killed Kuntar, who was released in a 2008 prisoner swap after spending nearly three decades in Israeli prison for his role in a deadly terrorist attack.

READ: Oct. 23, 2008: Newly freed Kuntar says Israel must disappear

“We have no doubt that the Israeli enemy was behind the assassination in a blatant military operation,” Nasrallah said, according to the Naharnet news site.

Israel has not confirmed whether or not it was involved in the attack, but several Israeli officials praised Kuntar’s death.

READ: April 23, 1979: Thousands attend funeral services for Nahariya terrorist victims

Kuntar was responsible for the deaths of four Israelis, including a 4-year-old girl and her father, in a 1979 attack in Nahariya. He is suspected of planning multiple attacks against Israeli soldiers in the Golan Heights.

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