At least 12 Palestinians, including two boys, a pregnant woman and eight police officers, were killed Sunday by Israeli airstrikes in the war-torn Gaza Strip, hospital authorities said.

A strike Sunday morning hit a house in the urban refugee camp of Nuseirat in central Gaza and killed four people, including a couple in their 30s and their 10-year son, according to the nearby Al-Aqsa Martyrs Hospital. The woman had been pregnant with twins, the hospital said.