Plumes of smoke rose Thursday over the northern Gaza Strip where Israel's military urged civilians to evacuate, as rescuers said Israeli strikes across the territory killed more than 50 people.The latest evacuation warning for parts of Gaza City and neighbouring areas came hours after the United Nations said it had begun distributing around 90 truckloads of aid in Gaza -- the first such delivery since Israel imposed a total blockade on March 2.

Humanitarian aid struggles to reach Gaza amid a new round of deadly Israeli strikes. Diplomats came under attack in Jenin, while international pressure mounts on Israel.

Israeli air strikes killed at least 50 Palestinians in Gaza on Tuesday, local health authorities said, as Israel continues its bombardment despite mounting international pressure to stop military operations and allow aid into Gaza unimpeded.