The Israeli army is calling on all residents of Gaza City to flee in what observers see as a sign of imminent new military operations. People should leave the city in the north of the Gaza Strip for the towns of Deir Al-Balah and Al-Zawiya in the centre of the Palestinian territory, said the appeal posted in Arabic by a military spokesman. He also described routes that those affected can use without encountering checkpoints. Gaza City is a dangerous combat zone, the spokesman warned. Israeli media reported that the army had distributed leaflets in the city in the morning that urged people to l…