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However, there was no immediate confirmation from Hezbollah.
Lebanese Prime Minister Najib Mikati instructed the foreign ministry to submit a complaint to the UN Security Council over the raid on the coastal town of Batroun.
He was appointed as Hezbollah's deputy chief in 1991 by the armed group's then-secretary general Abbas al-Musawi.
Safieddine had been running Hezbollah alongside its deputy secretary general Naim Qassem since Nasrallah's assassination.
Wafiq Safa, who heads Hezbollah's liaison and coordination unit responsible for working with Lebanese security agencies, was targeted by Israel.
Israeli military spokesman Daniel Hagari said Israel knew Safieddine was in Hezbollah's intelligence headquarters when fighter jets bombed it last week.
Israel has been considering its response to Tuesday’s Iranian ballistic missile attack, which Iran carried out in retaliation for Israeli military actions in Lebanon.
The strike comes amid Israel's broader offensive against Hezbollah in southern Lebanon.
Israel's military spokesperson, Rear Admiral Daniel Hagari, said he was not aware of any casualties from the missile volley.
Israeli military has told its citizens to take shelter in safe rooms once the warning in sounded.
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