He had been tracked by an Israeli mini drone as he lay dying in the ruins of the building that had been bombarded by IDF artillery.
Sinwar was filmed covered in dust as slumped in a chair, according to footage released by Israel.
Israeli military spokesperson Daniel Hagari said: “Sinwar fled alone into one of the buildings. Our forces used a drone to scan the area, which you can see here in the footage I’m presenting.
“Sinwar, who was injured in his hand by gunfire, can be seen here with his face covered, in his final moments, throwing a wooden plank at the drone.”
The IDF said that it has also expanded its operations in the Jabalia area of northern Gaza. It claimed “dozens of terrorists” were killed on Thursday night in “incidents and airstrikes”.
On Friday, Benjamin Netanyahu, the Israeli prime minister, was expected to hold a special security meeting at the Kirya military headquarters in Tel Aviv, alongside government ministers and security officials.