text:  The Israeli military says it killed a top Hamas commander in a major airstrike on a humanitarian zone in the southern part of Gaza. But as NPR's Hadil Alshalchi reports, the fate of another more senior Hamas leader isn't known. The Israeli military announced on Sunday that Rafah Salameh, the top Hamas commander in Khan Yunus, was killed on a Saturday airstrike in the city's western district of Al-Muwasi.