At least 30 people, including children, were killed in Gaza by Israeli strikes overnight and into Friday morning, said hospital staff, as air sirens sounded across Israel and stalled ceasefire talks were set to resume.

Israeli airstrikes killed at least 50 people, including several children, across the Gaza Strip on Thursday, hitting Hamas security officers and an Israeli-declared humanitarian zone.

Israel warned Wednesday that it will intensify its strikes in Gaza if Hamas keeps up its rocket fire, as Palestinian rescuers reported dozens of deaths from Israeli strikes on the first day of the New Year.

Gaza's civil defence agency said Wednesday that an Israeli air strike in the territory's north killed at least 15 people, marking what the rescuers called the New Year's first deadly attack."The world welcomed the New Year with celebrations and festivities,