The new threat came as Israel widened its five-day Gaza campaign against Hamas and Islamic Jihad militants, firing artillery rounds into northern Gaza for the first time in decades.

• 这个新的威胁发出之际，以色列扩大了针对哈马斯和伊斯兰圣战组织发动的五天加沙攻势，几十年来首次向加沙北部发射炮弹。