Jerusalem (CNN)-- A ceasefire in the bloody Israeli-Palestinian conflict could be "imminent, possibly within 24 hours," Hamas officials told CNN Wednesday, as world leaders dialed up pressure on both sides to end the fighting. Israel, however, has not commented on the possibility of a ceasefire deal.

Concerns have been growing over the worsening humanitarian situation, as the conflict raged for a 10th day Wednesday, pushing the Palestinian death toll to more than 220 people -- including more than 60 children -- and 12 people in Israel, including two children.

The Norwegian Refugee Council (NRC) said Tuesday that 11 children in Gaza between the ages of 5 and 15 had been participating in its trauma treatment program before Israeli airstrikes killed them in their homes.