Three weeks after claiming his death, Israel on Sunday confirmed that Mohammed Sinwar, brother to slain Hamas leader Yahya Sinwar, was killed in a May 13 airstrike and found in a tunnel beneath the European Hospital in Khan Younis.

The Israeli military announced the discovery after what it called a “targeted operation” involving extensive identification procedures.

Sinwar, presumed to be a high-ranking Hamas commander, was a key figure in the group’s operations in southern Gaza.

Prime Minister Benjamin Netanyahu first revealed the news Wednesday during a fiery Knesset debate. “In the past 48 hours, we’ve been executing a dramatic plan to crush Hamas – taking control of their food distribution and financial systems,” Netanyahu said. He credited the Israeli Defense Forces (IDF) with killing “thousands” of fighters, including Sinwar.

Hamas has not issued a statement on Sinwar’s death.