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Hezbollah-linked news outlets are reporting that deputy Hamas leader Saleh Arouri was killed by an Israeli air strike.
Al-Mayadeen, a publication linked to Hezbollah, reported that the high-ranking Hamas official was killed in the Beirut suburb of Dahiyeh.
Israeli officials have denied involvement in the strike, but noted the "surgical" precision of the attack.
"Israel has not taken responsibility for this attack. But whoever did it must be clear that this was not an attack on the Lebanese state," Netanyahu adviser Ambassador Mark Regev told MSNBC.