The Israeli military on Thursday named nine men it said were Hamas militants killed in Gaza airstrikes that the U.N. Palestinian refugee agency UNRWA said had left six of its staffers dead.
The military said three of the Hamas men had doubled as UNRWA workers.
UNRWA said six staffers were killed in two airstrikes that hit a school in central Gaza on Wednesday, the highest death toll among its staff in a single incident.
UNRWA said the school compound in central Gaza had been serving as a shelter for displaced people. The Israeli military said it was also being used by Hamas militants.
The Israeli military says it takes steps to reduce the risk of harm to non-combatants in Gaza while it battles militants who use Palestinian civilians as human shields. Hamas denies this.