Israeli strikes on the southern Gaza city of Rafah overnight killed 22 people, including 18 children, health officials said Sunday.

Israel has carried out near-daily air raids on Rafah, where more than half of Gaza’s population of 2.3 million has sought refuge from fighting elsewhere. It has also vowed to expand its ground offensive against the Hamas militant group to the city on the border with Egypt despite calls for restraint, including from the United States.

The first Israeli strike in Rafah killed a man, his wife and their three-year-old child, according to the nearby Kuwaiti Hospital, which received the bodies. The woman was pregnant and the doctors saved the baby, the hospital said. The second strike killed 17 children and two women from an extended family.