Hamas' armed wing al-Qassam Brigades said on Wednesday that seven civilian hostages were killed in Israeli strikes on Jabalia refugee camp, including three foreign passport holders.
Hamas has so far released four civilians among the 239 believed to be held.
The Israeli military said Tuesday's strikes on Jabalia, Gaza's largest refugee camp, had killed Ibrahim Biari, a Hamas commander it said was "pivotal" in the planning and execution of the Oct. 7 assault, as well as dozens of Hamas militants.
Palestinian health officials said at least 50 Palestinians were killed and 150 wounded, while a Hamas statement said there were 400 dead and injured in Jabalia, which houses families of refugees from wars with Israel dating back to 1948.