(excerpts from article)
The United Nations says it has received reports that about 30 Palestinians were killed when Israeli forces shelled a house after they had moved about 110 civilians inside it.
"According to several testimonies, on 4 January Israeli foot soldiers evacuated approximately 110 Palestinians into a single-residence house in Zeitun, warning them to stay indoors," the UN report said on Friday.
"Twenty-four hours later, Israeli forces shelled the home repeatedly, killing approximately 30."
The incident took place on Monday in the Zeitun neighbourhood of Gaza City on Monday, the report said.
The UN Office for the Co-ordination of Humanitarian Affairs (OCHA) called it "one of the gravest incidents since the beginning of operations" by Israeli forces in Gaza on December 27.
"Those who survived and were able walked two kilometres to Salah Ed Din road before being transported to hospital in civilian vehicles," OCHA said.
"Three children, the youngest of whom was five months old, died upon arrival at the hospital."
The Israeli military said on Friday that it had no knowledge of the incident.