of the hostages held by hamas call for the israeli government to do more to bring them home. here in london, pro palestinian demonstrators turn out in force. these are live pictures. protests are also planned in other capital cities. fresh aid enters gaza, whilejuliette touma from the un tells the bbc they have managed to re establish some contact with their teams. this is bbc news. the israeli military says troops and tanks remain on the ground in gaza, after it intensified its operation against hamas, by land, air and sea. it said air attacks hit 150 underground targets and killed several senior hamas commanders. hamas s armed wing says it is engaging israeli troops. in the past few minutes, israel has again warned people in the north of gaza to head south, saying their window to act was closing . as the israeli operation unfolded, a bbc correspondent in gaza reported a huge bombardment in northern gaza, which he said was on an unprecedented scale. he described scenes of p