Gaza’s Health Ministry says at least 274 Palestinians were killed in the Israeli air and ground raid that rescued four hostages held by Hamas. The ministry said on Sunday that around 700 people were also wounded in Saturday’s operation. The United Nations and other international institutions and experts, as well as Palestinian authorities in the West Bank — rivals of Hamas — say the Gaza ministry has long made a good-faith effort to account for the dead under the most difficult conditions. The EU’s top foreign affairs chief posted that “the bloodbath must end immediately.” The operation deep i…