Gaza security officials say an Israeli airstrike targeting a strip has killed one Palestinian, wounded a second and left three more missing.
Palestinian officials said at least one other person was missing after the raids, which targeted tunnels used to smuggle in goods from Egypt.
The Israeli army said the raids were in retaliation for attacks against Israelis over the past week.
The Hamas attacks killed four settlers and wounded two others. They took place as Israelis and Palestinians relaunched direct peace negotiations in Washington.