GAZA CITY, Palestine / ANKARA At least 81 Palestinians, including children, were killed on Sunday in a series of Israeli airstrikes across the Gaza Strip, according to medical sources and local reports. In Gaza City, 25 people were killed when Israeli warplanes bombed two homes sheltering displaced families in the Sheikh Radwan and Al-Nasr neighborhoods, a medical source said. Eyewitnesses said the houses were filled with sleeping families, mostly women and children, when the strikes occurred.