The UN Human Rights Office says Israeli attacks on and around hospitals have pushed Gaza's healthcare system to "the brink of total collapse" and raised serious concerns about war crimes and crimes against humanity.

Israeli attacks on hospitals in Gaza have devastated the Palestinian enclave's health system and raised serious concerns about Israel's compliance with international law, the U.N. Human Rights Office said in a report on Tuesday.

Israeli strikes killed at least 12 Palestinians in the Gaza Strip, mostly women and children, Gaza officials said Wednesday, as the nearly 15-month war ground on into the new year.

Seventeen people have been killed and others injured in new Israeli attacks in the Gaza Strip, Palestinian media reported on Wednesday. These included 15 people, including children, who died in the shelling of a residential building in northern Jabaliya,